Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Share Based Compensation Types, Excluding Stock Options Share Based Compensation Types, Excluding Stock Options [Member] Share Based Compensation Types, Excluding Stock Options [Member] Stock Options Employee Stock Option [Member] Performance Unit Performance Shares [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] UGI Omnibus Equity Compensation Plan UGI Omnibus Equity Compensation Plan [Member] UGI Omnibus Equity Compensation Plan [Member] UGI Units and UGI Stock Options UGI Units and UGI Stock Options [Member] UGI Units and UGI Stock Options [Member] UGI Stock Options UGI Stock Options [Member] UGI Stock Options [Member] UGI Units UGI Units [Member] UGI Units [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Liabilities Other Current Liabilities [Member] Other Noncurrent Liabilities Other Noncurrent Liabilities [Member] Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Award vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Exercise period after grant date - no more than (in years) Options Can be Exercised Options Can Be Exercised. Percent of target award paid to grantee Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Award to be Granted Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Award to be Granted Allocated share-based compensation expense Allocated Share-based Compensation Expense Allocated share-based compensation expense, after-tax Allocated Share-based Compensation Expense, Net of Tax Nonvested awards, total compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Nonvested awards, total compensation cost not yet recognized, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Number of equity-based units for unrecognized compensation expense (in units) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Deferred compensation arrangements, liability, current Deferred Compensation Share-based Arrangements, Liability, Current Deferred compensation arrangements, liability, noncurrent Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent Regulated Operations [Abstract] Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Removal Costs Removal Costs [Member] Deferred Project Costs Deferred Project Costs [Member] Income Tax Benefits Income Tax Benefits [Member] Income Tax Benefits [Member] Future Amortization Of Regulatory Liabilities Future Amortization Of Regulatory Liabilities [Member] Future Amortization Of Regulatory Liabilities [Member] Regulatory Liability [Axis] Regulatory Liability [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] Postretirement benefits overcollections Postretirement Benefit Costs [Member] Regulatory Agency [Axis] Regulatory Agency [Axis] Regulatory Agency [Domain] Regulatory Agency [Domain] Pennsylvania Public Utility Commission Pennsylvania Public Utility Commission [Member] Pennsylvania Public Utility Commission Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] UGI South UGI South [Member] UGI South [Member] UGI North UGI North [Member] UGI North [Member] UGI Central UGI Central [Member] UGI Central [Member] Electric Utilities Electric Utilities [Member] Electric Utilities [Member] PNG PNG [Member] PNG [Member] UGI Gas UGI Gas [Member] UGI Gas [Member] CPG CPG [Member] CPG [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Information Technology Technology Equipment [Member] Regulatory Assets Regulatory Assets [Line Items] Average remaining depreciable lives of the associated property Average Remaining Depreciable Lives of Associated Property Average remaining depreciable lives of associated property. Period to recover costs related to regulatory assets Regulatory Asset, Amortization Period Regulatory liability, period over which overcollections will be refunded to customers Regulatory Liability, Amortization Period Unrealized gains (losses) on derivative financial instruments contracts Gas utility unrealized gains or losses on derivative financial instruments contracts Unrealized gains or losses on derivative financial instruments contracts. PUC temporary rates order, percent of reduction in base rate revenues PUC Temporary Rates Order, Percent of Reduction In Base Rate Revenues PUC Temporary Rates Order, Percent of Reduction In Base Rate Revenues PUC Temporary Rates Order, Reduction In Revenue PUC Temporary Rates Order, Reduction In Revenue PUC Temporary Rates Order, Reduction In Revenue Requested operating revenue increase Public Utilities, Requested Rate Increase (Decrease), Amount Public utilities, requested increase in annual base distribution revenues Public Utilities, Requested Increase In Annual Base Distribution Revenues Public Utilities, Requested Increase In Annual Base Distribution Revenues Tax Cuts And Jobs Act Of 2017, customer billing credit Tax Cuts And Jobs Act Of 2017, Customer Billing Credit Tax Cuts And Jobs Act Of 2017, Customer Billing Credit Amount of operating revenue increase Public Utilities, Interim Rate Increase (Decrease), Amount Approved operating revenue increase Public Utilities, Approved Rate Increase (Decrease), Amount Distribution system improvement charge, percent of amount billed to customers Distribution System Improvement Charge, Percent of Amount Billed to Customers Distribution System Improvement Charge, Percent of Amount Billed to Customers Public utilities, civil penalties Public Utilities, Civil Penalties Public Utilities, Civil Penalties Capitalized project costs Deferred Costs Project costs expensed in prior periods Public Utilities, Reclassification of Project Costs Expensed in Prior Periods Public Utilities, Reclassification of Project Costs Expensed in Prior Periods Associated increase to utility property, plant and equipment Property, Plant and Equipment, Other, Gross Associated increase to utility regulatory assets Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock, without par value Common Stock [Member] Retained earnings Retained Earnings [Member] Additional paid-in capital Additional Paid-in Capital [Member] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Statement Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of year Stockholders' Equity Attributable to Parent Net income Net Income (Loss) Attributable to Parent Cash dividends — Common Stock Dividends, Cash Excess tax benefits on equity-based compensation Stockholders' Equity, Other Net gains (losses) on derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Reclassifications of net losses on derivative instruments Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Benefit plans, principally actuarial gains (losses) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Reclassifications of benefit plans actuarial losses and net prior service benefits Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Balance, end of year Component of Operating Income [Abstract] Non-tariff service income Non-tariff Service Revenue Non-tariff service revenue Environmental matters Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses and Revision in Estimates Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses and Revision in Estimates Net interest on PGC overcollections Interest Income (Expense), Nonoperating, Net Other, net Other Miscellaneous Operating Income (Expense), Net Other Miscellaneous Operating Income (Expense), Net Total other operating income (expense), net Other Operating Income (Expense), Net Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Equity [Abstract] Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Segment Reporting [Abstract] Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net gains (losses) on derivative instruments (net of tax of $(10), $0 and $12,016, respectively) Reclassifications of net losses on derivative instruments (net of tax of $(1,118), $(1,409) and $(1,112), respectively) Benefit plans, principally actuarial gains (losses) (net of tax of $(1,512), $(1,336) and $2,267, respectively) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Reclassifications of benefit plans actuarial losses and net prior service benefits (net of tax of $(411), $(678) and $(454), respectively) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Taxes [Table] Income Taxes [Table] Income taxes. Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State and Local Jurisdiction State and Local Jurisdiction [Member] Income Taxes Income Taxes [Line Items] Income taxes line items. Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit, Including Unrecognized Deferred Tax Liability Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit, Including Unrecognized Deferred Tax Liability Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit, Including Unrecognized Deferred Tax Liability Decrease in income tax expense due to state tax flow through of accelerated depreciation Income Tax Expense (Benefit), Accelerated Depreciation Income Tax Expense (Benefit), Accelerated Depreciation Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Unrecognized Deferred Tax Liability Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Unrecognized Deferred Tax Liability Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Unrecognized Deferred Tax Liability Increase (Decrease) In Regulatory Liabilities, Excess Deferred Income Taxes Increase (Decrease) In Regulatory Liabilities, Excess Deferred Income Taxes Increase (Decrease) In Regulatory Liabilities, Excess Deferred Income Taxes Interest (income) expense Investment Income, Net Unrecognized tax benefits Unrecognized Tax Benefits Accrued interest Unrecognized Tax Benefits, Interest on Income Taxes Accrued Unrecognized tax benefits if recognized would impact the reported effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation, Depletion and Amortization Deferred income taxes, net Deferred Income Tax Expense (Benefit) Pension contributions, net of pension cost Pension Contributions, Net of Pension Expense Pension Contributions, Net of Pension Expense Settlement of interest rate protection agreements Settlement on Derivative Instruments Settlement on Derivative Instruments Provision for uncollectible accounts Provision for Doubtful Accounts Regulatory liability resulting from tax reform Other, net Other Noncash Income (Expense) Net change in: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable and accrued utility revenues Increase (Decrease) in Accounts and Other Receivables Inventories Increase (Decrease) in Inventories Deferred fuel and power costs, net of changes in unsettled derivatives Increase (Decrease) in Deferred Fuel Costs Accounts payable Increase (Decrease) in Accounts Payable, Trade Prepaid income taxes Increase (Decrease) in Prepaid Taxes Other current assets Increase (Decrease) in Other Current Assets Other current liabilities Increase (Decrease) in Other Current Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Expenditures for property, plant and equipment Payments to Acquire Property, Plant, and Equipment Net costs of property, plant and equipment disposals Payments For (Proceeds From) Property, Plant, And Equipment Disposal Payments For (Proceeds From) Property, Plant, And Equipment Disposal Decrease (increase) in restricted cash Increase (Decrease) in Restricted Cash Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Payment of dividends Payments of Ordinary Dividends, Common Stock Increase in short-term borrowings Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less Issuances of long-term debt, net of issuance costs Proceeds from Issuance of Long-term Debt Repayments of long-term debt Repayments of Long-term Debt Excess tax benefits from equity-based payment arrangements Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash and cash equivalents increase (decrease) Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS: Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] End of year Cash and Cash Equivalents, at Carrying Value Beginning of year Increase (decrease) SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid (received) for: Cash paid [Abstract] Cash paid. Interest Interest Paid Income taxes Income Taxes Paid, Net Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] PNG and CPG PNG and CPG [Member] PNG and CPG [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Environmental Issue Environmental Issue [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] CPG; PNG and UGI Gas COAs CPG-COA, PNG-COA and UGI Gas-COA [Member] CPG-COA, PNG-COA and UGI Gas-COA [Member] Contingencies Contingencies [Line Items] Contingencies [Line Items] Number of subsidiaries acquired with similar histories Number of Subsidiaries Acquired Number of Subsidiaries Acquired Environmental expenditures cap during calendar year Environmental Expenditures Cap During Year Environmental Expenditures Cap During Year Accrued liabilities for environmental investigation and remediation costs Accrual for Environmental Loss Contingencies Derivative Instruments and Hedging Activities Disclosure [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instruments, Assets Derivative Financial Instruments, Assets [Member] Derivative Instruments, Liabilities Derivative Financial Instruments, Liabilities [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate contracts Interest Rate Contract [Member] Commodity Contract Subject to PGC and DS Mechanisms Commodity Contract Subject to PGC and DS Mechanisms [Member] Commodity Contract Subject to PGC and DS Mechanisms [Member] Commodity Contract Not Subject to PGC and DS Mechanisms Commodity Contract Not Subject to PGC and DS Mechanisms [Member] Commodity Contract Not Subject to PGC and DS Mechanisms [Member] Derivatives, Fair Value Derivatives, Fair Value [Line Items] Derivative assets: Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] Fair value of derivative assets, gross Derivative Asset, Fair Value, Gross Asset Gross amounts offset in the balance sheet Derivative Asset, Fair Value, Gross Liability Total derivative assets - net Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative liabilities: Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] Fair value of derivative liabilities, gross Derivative Liability, Fair Value, Gross Liability Gross amounts offset in the balance sheet Derivative Liability, Fair Value, Gross Asset Total derivative liabilities - net Derivative Liability, Fair Value, Amount Not Offset Against Collateral Accounting Policies [Abstract] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Derivative [Table] Derivative [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured Debt Unsecured Debt [Member] Interest Rate Swap Agreement Interest Rate Swap Agreement [Member] Interest Rate Swap Agreement [Member] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Gas Utility Gas Utility [Member] Gas utility. Interest Rate Protection Agreements Interest Rate Protection Agreements [Member] Interest rate protection agreements. Derivative Derivative [Line Items] Notional amount (in units) Derivative, Nonmonetary Notional Amount, Energy Measure Maximum length of time hedged in price risk cash flow hedges (in months) Maximum Length of Time Hedged in Price Risk Cash Flow Hedges Maximum length of time hedged in price risk cash flow hedges. Underlying variable rate debt Derivative, Notional Amount Interest rate cash flow hedge loss to be reclassified during next 12 months, net Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Restricted cash in brokerage accounts Restricted Cash and Cash Equivalents, Current Aggregate principal amount Debt Instrument, Face Amount Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Quarterly Financial Data [Abstract] Quarterly Data (unaudited) Quarterly Financial Information [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Defined Benefit Plan [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Benefits Pension Plan [Member] Other Postretirement Benefits Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Fiscal 2018 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Fiscal 2019 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Fiscal 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Fiscal 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Fiscal 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Fiscal 2024 - 2028 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Series Preferred Stock Preferred Stock [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue, Consolidated Sales Revenue, Net [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Electric Utility Electric Utility [Member] Electric utility. Segment Reporting Information Segment Reporting Information [Line Items] Measurement Disclosures Measurement Disclosures [Abstract] Measurement Disclosures Number of reportable segments (in segments) Number of Reportable Segments Number of counties Counties Of Operation, Number Counties Of Operation, Number Number of customers Number of Customers Exceeding Threshold Number of customers exceeding threshold Revenues Revenue, Net Cost of sales Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization Operating income Operating Income (Loss) Interest expense Interest and Debt Expense Income before income taxes Income (Loss) Before Income Taxes Income (loss) before income taxes. Total assets Assets Goodwill Goodwill Capital expenditures (including the effects of accruals) Property, Plant and Equipment, Additions Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Senior Notes Senior Notes [Member] Medium-term Notes Medium-term Notes [Member] Term Loan Term Loan [Member] Term Loan [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 4.12%, due September 2046 Senior Notes due September 2046 [Member] Senior Notes due September 2046 [Member] 4.98%, due March 2044 Senior 4 Point 98 Percent Notes, Due March 2044 [Member] Senior 4 Point 98 Percent Notes, Due March 2044 [Member] 4.12%, due October 2046 Senior Notes due October 2046 [Member] Senior Notes due October 2046 [Member] 6.21%, due September 2036 Senior 6 Point 21 Percent Notes, Due September 2036 [Member] Senior 6 Point 21 Percent Notes, Due September 2036 [Member] 2.95%, due June 2026 Senior Notes due June 2026 [Member] Senior Notes due June 2026 [Member] 6.17%, due June 2017 Medium Term 6 Point 17 Percent Notes, Due June 2017 [Member] Medium Term 6 Point 17 Percent Notes, DueJune 2017 [Member] 7.25%, due November 2017 Medium Term 7 Point 25 Percent Notes, Due November 2017 [Member] Medium Term 7 Point 25 Percent Notes, Due November 2017 [Member] 5.67%, due January 2018 Medium Term 5 Point 67 Percent Notes, Due January 2018 [Member] Medium Term 5 Point 67 Percent Notes, Due January 2018 [Member] 6.50%, due August 2033 Medium Term 6 Point 50 Percent Notes, Due August 2033 [Member] Medium Term 6 Point 50 Percent Notes, Due August 2033 [Member] 6.13%, due October 2034 Medium Term 6 Point 13 Percent Notes, Due October 2034 [Member] Medium Term 6 Point 13 Percent Notes, Due October 2034 [Member] Debt Instrument Debt Instrument [Line Items] Interest rate Debt Instrument, Interest Rate, Stated Percentage Total long-term debt Long-term Debt, Gross Capital Lease Obligations Capital Lease Obligations Less: unamortized debt issuance costs Debt Issuance Costs, Net Less: current maturities Long-term Debt and Capital Lease Obligations, Current Total long-term debt due after one year Long-term Debt and Capital Lease Obligations Accounting Changes and Error Corrections [Abstract] Accounting Changes Accounting Changes and Error Corrections [Text Block] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] VEBA Trust VEBA Trust [Member] VEBA Trust. Defined Benefit Plan by Plan Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Equity investments Equity Securities [Member] Domestic Equity Securities Domestic [Member] Equity Securities Domestic. International Equity Securities International [Member] Equity Securities International. Fixed income funds & cash equivalents Fixed Income Funds and Cash Equivalents [Member] Fixed Income Funds And Cash Equivalents. Actual pension plan Defined Benefit Plan, Actual Plan Asset Allocations Target asset allocation Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Composition of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Operations Nature of Operations [Text Block] Schedule of Regulatory Assets Schedule of Regulatory Assets [Table Text Block] Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Rental expense Operating Leases, Rent Expense 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years After 2023 Operating Leases, Future Minimum Payments, Due Thereafter Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Provisions for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation from US Federal Statutory Tax Rate to Effective Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Deferred Tax Liabilities (Assets) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Schedule of Share Based Compensation Arrangement by Share Based Payment Award Type [Axis] Schedule of Share Based Compensation Arrangement by Share Based Payment Award Type [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Type Share Based Compensation Arrangement by Share Based Payment Award Type [Domain] Share Based Compensation Arrangement by Share Based Payment Award Type [Domain] Share Based Compensation Arrangement By Share Based Payment Award Type. Vested Vested [Member] Vested. UGI Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance (in units) Granted (in units) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Performance criteria not net (in units) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Performance Criteria Not Met Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Performance Criteria Not Met Unit awards paid (in units) Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Unit Awards Paid Share based compensation arrangement by share based payment award equity instruments other than options unit awards paid. Ending balance (in units) Weighted-Average Grant-Date Fair Value (per Unit) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Performance criteria not met (in usd per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Performance Criteria Not Met, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Performance Criteria Not Met, Weighted Average Grant Date Fair Value Unit awards paid (in usd per share) Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Unit Awards Paid Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award equity instruments other than options unit awards paid weighted average grant date fair value. Ending balance (in usd per share) Debt Debt Disclosure [Text Block] Employee Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Regulatory Assets and Liabilities and Regulatory Matters Public Utilities Disclosure [Text Block] Excess book basis over tax basis of property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Goodwill Deferred Tax Liabilities, Goodwill Derivative financial instruments Deferred Tax Liabilities, Derivatives Regulatory assets Deferred Tax Liabilities, Regulatory Assets Other Deferred Tax Liabilities, Other Gross deferred tax liabilities Deferred Tax Liabilities, Gross Pension plan liabilities Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Allowance for doubtful accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Deferred investment tax credits Deferred Tax Assets, Deferred Investment Tax Credits Deferred Tax Assets, Deferred Investment Tax Credits Employee-related expenses Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Regulatory liabilities Deferred Tax Assets, Regulatory Liabilities Deferred Tax Assets, Regulatory Liabilities Environmental liabilities Deferred Tax Assets, Environmental Liabilities Deferred Tax Assets, Environmental Liabilities Derivative financial instruments Deferred Tax Assets, Derivative Instruments Other Deferred Tax Assets, Other Gross deferred tax assets Deferred Tax Assets, Gross Net deferred tax liabilities Deferred Tax Liabilities, Net Other Operating Income (Expense), Net Other Income and Other Expense Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Distribution Distribution [Member] Distribution. Transmission Transmission [Member] Transmission. Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software [Member] Construction in process Construction in Progress [Member] General and other General and Other Including Work in Process [Member] General and other including work in process. Property, Plant and Equipment Property, Plant and Equipment [Line Items] Property, plant and equipment Property, Plant and Equipment, Gross Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] AOCI Attributable to Parent Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Reclassifications, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Benefit plans, principally actuarial gains Revenues Net income (loss) Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying amount Reported Value Measurement [Member] Estimated fair value Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Long-term debt Long-term Debt, Fair Value Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts Allowance for Doubtful Accounts [Member] Valuation and Qualifying Accounts Disclosure Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of year Valuation Allowances and Reserves, Balance Charged to costs and expenses Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Other Valuation Allowances and Reserves Charged Uncollectible Accounts Written Off Net Recoveries Valuation allowances and reserves charged uncollectible accounts written off net recoveries. Balance at end of year Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Income Statement [Abstract] Costs and expenses: Costs and Expenses [Abstract] Cost of sales — gas and purchased power (excluding depreciation shown below) Operating and administrative expenses Operating Expenses Operating and administrative expenses — related parties Related Party Transaction, Expenses from Transactions with Related Party Depreciation Depreciation Other operating (income) expense, net Costs and expenses Costs and Expenses Operating income Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income taxes Income Tax Expense (Benefit) Net income Schedule II - Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Current expense (benefit): Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current (benefit) expense Current Income Tax Expense (Benefit) Deferred expense (benefit): Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Investment tax credit amortization Investment Tax Credit Amortization Investment tax credit amortization. Total deferred expense Total income tax expense Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Change in benefit obligations: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Benefit obligations — beginning of year Defined Benefit Plan, Benefit Obligation Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Actuarial gain Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Benefit obligations — end of year Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair value of plan assets — beginning of year Defined Benefit Plan, Fair Value of Plan Assets Actual gain on assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Fair value of plan assets — end of year Funded status of the plans — end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Assets (liabilities) recorded in the balance sheet: Liability, Defined Benefit Plan [Abstract] Assets in excess of liabilities – included in other noncurrent assets Pension and Other Postretirement Defined Benefit Plans, Assets in Excess of Liabilities, Noncurrent Pension and Other Postretirement Defined Benefit Plans, Assets in Excess of Liabilities, Noncurrent Unfunded liabilities – included in other noncurrent liabilities Liability, Defined Benefit Plan, Noncurrent Net amount recognized Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Amounts recorded in stockholder’s equity (pre-tax): Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] Prior service cost (benefit) Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Net actuarial loss (gain) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Amounts recorded in regulatory assets and liabilities (pre-tax): Amounts Recorded in Regulatory Assets and Liabilities Pre Tax [Abstract] Amounts recorded in regulatory assets and liabilities pre tax. Prior service cost (benefit) Defined Benefit Plan Prior Service Cost Credit Recorded in Regulatory Assets and Liabilities Pre Tax Defined benefit plan prior service cost credit recorded in regulatory assets and liabilities pre tax. Net actuarial loss (gain) Defined Benefit Plan Net Actuarial Loss Recorded in Regulatory Assets and Liabilities Pre Tax Defined benefit plan net actuarial loss recorded in regulatory assets and liabilities pre tax. Total Defined Benefit Plan Recorded in Regulatory Assets and Liabilities Pre Tax Defined benefit plan recorded in regulatory assets and liabilities pre tax. Basis of Presentation Basis of Presentation [Policy Text Block] Basis of presentation. Principles of Consolidation Consolidation, Policy [Policy Text Block] Effects of Regulation Utility, Revenue and Expense Recognition, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Derivative Instruments Derivatives, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment and Related Depreciation Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Employee Retirement Plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Equity-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Environmental Matters Regulatory Environmental Costs, Policy [Policy Text Block] Derivative Assets and Liabilities Including Offsetting Amounts Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Effects of Derivative Instruments on Consolidated Statements of Income and Changes in AOCI Derivative Instruments, Gain (Loss) [Table Text Block] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] UGI Utilities Employees UGI Utilities Employees [Member] UGI Utilities Employees [Member] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of: Amortization [Abstract] Prior service cost (benefit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net benefit cost (benefit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Change in associated regulatory liabilities Increase (Decrease) in Regulatory Liabilities Net benefit cost (benefit) after change in regulatory liabilities Net Periodic Benefit Cost after Change in Regulatory Liabilities Net periodic benefit cost after change in regulatory liabilities. Segment Information Segment Reporting Disclosure [Text Block] Schedule of Other Operating Income (Expense), Net Interest and Other Income [Table Text Block] Employees of UGI and Certain of its Other Subsidiaries Employees of UGI and Certain of its Other Subsidiaries [Member] Employees of UGI and Certain of its Other Subsidiaries [Member] Estimated amortization of net actuarial losses for Fiscal 2017 Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Amortization of net prior service costs (credits) Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year ABO for the Pension Plans Defined Benefit Plan, Accumulated Benefit Obligation Benefit obligations Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans Projected Benefit Obligations of Unfunded and Non Qualified Supplemental Executive Retirement Plans Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans. Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans Net Costs for Unfunded and Non Qualified Supplemental Executive Retirement Plans -- None. No documentation exists for this element. -- The aggregate holdings of all qualifying employer securities not to exceed the fair value of trust assets at the time of purchase Percentage of Aggregate Employer Securities Holdings to Not to Exceed Fair Value Assets Percentage of aggregate employer securities holdings to not to exceed fair value assets. Percentage of UGI Common Stock represented Pension Plan Assets Percentage of Common Stock Represented Pension Plan Assets Net costs for unfunded and non qualified supplemental executive retirement plans. Cost of benefits under Utilities Savings Plan Defined Contribution Plan, Cost Provisions for impairments Asset Impairment Charges Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] U.S. Pension Plan UNITED STATES Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis] Fair Value, Hierarchy [Axis] Fair Value Plan Fair Asset Measurement [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Total domestic equity investments Equity Funds [Member] S&P 500 Index equity mutual funds S&P 500 Index equity mutual funds [Member] S&P 500 Index equity mutual funds [Member] Small and midcap equity mutual funds Small and Midcap equity mutual funds [Member] Small and Midcap equity mutual funds [Member] UGI Corporation Common Stock International index equity mutual funds Total fixed income investments Fixed Income Funds [Member] Bond index mutual funds Bond index mutual funds [Member] Bond index mutual funds [Member] Cash equivalents Cash and Cash Equivalents [Member] Fair value of plan assets Other Alternative Investment, Fair Value Disclosure Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Commodity Contracts Commodity Contract [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Equity-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Goodwill impairments Goodwill, Impairment Loss Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current LIABILITIES AND STOCKHOLDER’S EQUITY Liabilities and Equity [Abstract] Common stockholder’s equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] One - Month LIBOR Rate One - Month LIBOR Rate [Member] One - Month LIBOR Rate [Member] Derivative Instruments [Axis] Derivative Instruments [Axis] Derivative Instruments [Axis] Derivative Instruments [Domain] Derivative Instruments [Domain] [Domain] for Derivative Instruments [Axis] Cross Currency Interest Rate Contract Cross Currency Interest Rate Contract [Member] Line of Credit Line of Credit [Member] Letter of Credit Letter of Credit [Member] Senior Notes due June 2026 4.12% Senior Notes, due September 2046 Senior Notes Due September 2016 Senior Notes Due September 2016 [Member] Senior Notes Due September 2016 [Member] Medium-term Notes Due October 2015 Medium-term Notes Due October 2015 [Member] Medium-term Notes Due October 2015 [Member] Medium-term Notes Due December 2015 Medium-term Notes Due December 2015 [Member] Medium-term Notes Due December 2015 [Member] Flaga Term Loan Due September Twenty Eighteen Flaga Term Loan Due September Twenty Eighteen [Member] Flaga Term Loan Due September Twenty Eighteen [Member] UGI Utilities 2015 Credit Agreement UGI Utilities Twenty Fifteen Credit Agreement [Member] UGI Utilities Twenty Fifteen Credit Agreement Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Due in Fiscal 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Due in Fiscal 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two Due in Fiscal 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three Due in Fiscal 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four Due in Fiscal 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Principal repayment in equal quarterly installments Debt Instrument, Periodic Payment, Principal Credit agreement Line of Credit Facility, Maximum Borrowing Capacity Margin on term loan base rate borrowings (as a percent) Debt instrument, interest rate, effective percentage Debt Instrument, Interest Rate, Effective Percentage Short-term borrowings Short-term Bank Loans and Notes Payable Weighted average interest rate at period end Line of Credit Facility, Interest Rate at Period End Issued and outstanding letters of credit Letters of Credit Outstanding, Amount Debt to capital ratio Debt Instrument, Covenant Terms, Maximum Consolidated Debt to Consolidated Total Capital Ratio Debt Instrument, Covenant Terms, Maximum Consolidated Debt to Consolidated Total Capital Ratio U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Difference in tax rate due to: Difference in Tax Rate Due To [Abstract] Difference in tax rate due to. State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effect of tax rate changes - TCJA Effective Income Tax Rate Reconciliation, Change In Enacted Tax Rate, Increase (Decrease) In Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change In Enacted Tax Rate, Increase (Decrease) In Tax Rate, Percent Excess tax benefits on share-based payments Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] UGI and Subsidiaries UGI And Subsidiaries [Member] UGI And Subsidiaries [Member] Energy Services UGI Energy Services, Inc. [Member] UGI Energy Services, Inc. [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Administrative Services Administrative Services [Member] Administrative Services [Member] SCAAs Storage Contract Administrative Agreements [Member] Storage Contract Administrative Agreements [Member] Exclusive of Transactions Pursuant SCAAs Exclusive of transactions pursuant SCAAs [Member] Exclusive of transactions pursuant SCAAs [Member] Related Party Transaction Related Party Transaction [Line Items] Amount of related party transaction Related Party Transaction, Amounts of Transaction Agreement term (in years) Storage Agreement, Term Storage Agreement, Term Number of storage agreements Number of Storage Agreements Number of Storage Contract Administrative Agreements Related party costs incurred Related party security deposits Related Party Deposit Liabilities Volume of gas storage inventory (in bcf of natural gas) Volume Of Gas Storage Inventory Volume Of Gas Storage Inventory Natural gas storage inventory, related parties, current Natural Gas Storage Inventory, Related Parties, Current Natural Gas Storage Inventory, Related Parties, Current Revenue from related parties Revenue from Related Parties Purchases from related party Related Party Transaction, Purchases from Related Party Average composite depreciation rates Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Amortization period Depreciation expense Depreciation, Nonproduction Change in Pension Benefits and Other Postretirement Benefit Obligations, Plan Assets, and Funded Status Schedule of Net Funded Status [Table Text Block] Actuarial Assumptions for Domestic Plans Schedule of Assumptions Used [Table Text Block] Components of Net Periodic Pension Expense and Other Postretirement Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Expected Payments for Pension Benefits and Other Postretirement Welfare Benefits Schedule of Expected Benefit Payments [Table Text Block] Allocation of Pension Plan and VEBA Trust Assets Schedule of Allocation of Plan Assets [Table Text Block] Fair Value of Pension Plan and VEBA Trust Assets Fair Value of Pension Plan and Veba Trust Assets [Table Text Block] Fair value of pension plan and VEBA trust assets. Public Utilities, Inventory [Table] Public Utilities, Inventory [Table] Public Utilities, Inventory Public Utilities, Inventory [Line Items] Number of storage agreements Number of Storage Contract Administrative Agreements Number of Storage Contract Administrative Agreements Storage agreement, term (in years) Number of storage agreements with Energy Services Number of Storage Agreements with Energy Services Number of storage agreements with Energy Services Number of storage agreements with non-affiliates Number of Storage Agreements with Non-Affiliates Number of Storage Agreements with Non-Affiliates Volume of gas storage inventories released under SCAAs with non-affiliates (in bcf) Volume of Gas Storage Inventories Released Volume of gas storage inventories released. Carrying value of gas storage inventories released under SCAAs with non-affiliates Storage Inventory Released Carrying amount as of the balance sheet date of natural gas storage inventories released under SCAA's. Security deposit liability Security Deposit Liability Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Public Utilities, Inventory [Axis] Inventory [Axis] Public Utilities, Inventory, Type [Domain] Inventory [Domain] Gas Utility natural gas Gas Utility Natural Gas [Member] Gas Utility natural gas. Materials, supplies and other Materials, Supplies and Other [Member] Materials, supplies and other. Total inventories Inventory, Net Reconciliation of Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits – beginning of year Additions for tax positions taken in prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Settlements with tax authorities/statute lapses Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized tax benefits – end of year Related Party Transactions Related Party Transactions Disclosure [Text Block] Tax on (loss) gain on derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Tax on reclassifications of net losses (gains) on derivative instruments Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Tax on benefit plans Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Tax on reclassification of benefits plans actuarial losses and prior service cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Income taxes recoverable Income Taxes Recoverable [Member] Income taxes recoverable. Underfunded pension and postretirement plans Pension Costs [Member] Environmental costs Environmental Restoration Costs [Member] Deferred fuel and power costs Deferred Fuel Costs [Member] Removal costs, net Removal Costs, Net [Member] Removal costs net. Other Other Regulatory Assets [Member] Other regulatory assets. Regulatory assets Regulatory Assets Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Deferred fuel and power refunds Deferred Fuel and Power Refunds [Member] Deferred fuel and power refunds. State income tax benefits — distribution system repairs Deferred Income Tax Charge [Member] PUC temporary rates order PUC Temporary Rates Order [Member] PUC Temporary Rates Order [Member] Excess Federal Deferred Income Taxes Excess Federal Deferred Income Taxes [Member] Excess Federal Deferred Income Taxes [Member] Other Other Liabilities [Member] Regulatory Liabilities [Line Items] Regulatory Liabilities [Line Items] Regulatory liabilities Regulatory Liabilities Increase (decrease) in accounts payable, trade Schedule of Inventories Schedule of Inventory, Current [Table Text Block] UGI Unit Award Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Pension Benefits Weighted-average assumptions: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate – benefit obligations Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Discount rate – benefit cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Rate of increase in salary levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedges Cash Flow Hedging [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Gasoline contracts Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest expense Interest Expense [Member] Operating and administrative expenses/other operating income, net Operating and administrative expenses/other income, net [Member] Operating and administrative expenses/other income, net [Member] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) Recognized in AOCI Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Loss Reclassified from AOCI into Income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Gain (Loss) Recognized in Income Derivative, Gain (Loss) on Derivative, Net Cash and cash equivalents Restricted cash Accounts receivable (less allowances for doubtful accounts of $9,760 and $4,052, respectively) Accounts Receivable, Net, Current Accounts receivable — related parties Accounts Receivable, Related Parties, Current Accrued utility revenues Accrued Utility Revenues Estimated amount due from natural gas and electric utility customers for distribution service and commodities rendered but not yet billed at the end of the period. Inventories Prepaid income taxes Prepaid Taxes Regulatory assets Deferred Fuel Cost Derivative instruments Derivative Instruments and Hedges, Assets Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Total current assets Assets, Current Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net property, plant and equipment Property, Plant and Equipment, Net Regulatory assets Regulatory Assets, Noncurrent Other assets Other Assets, Noncurrent Total assets Current liabilities: Liabilities, Current [Abstract] Current maturities of long-term debt Long-term Debt, Current Maturities Accounts payable — trade Accounts Payable, Current Accounts payable — related parties Accounts Payable, Related Parties, Current Employee compensation and benefits accrued Accrued Employee Benefits, Current Interest accrued Interest Payable, Current Customer deposits and advances Customer Advances and Deposits, Current Derivative instruments Derivative Instruments and Hedges, Liabilities Regulatory liabilities Regulatory Liability, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Deferred investment tax credits Accumulated Deferred Investment Tax Credit Pension and other postretirement benefit obligations Regulatory liabilities Regulatory Liability, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 12) Commitments and Contingencies Common Stock, $2.25 par value (authorized — 40,000,000 shares; issued and outstanding — 26,781,785 shares) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total common stockholder’s equity Total liabilities and stockholder’s equity Liabilities and Equity