2.4.0.6 Html 142 169 1 false 58 0 false 11 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.ugi.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 1001000 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.ugi.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets false false R3.htm 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.ugi.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Condensed Consolidated Statements of Income Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfIncome Condensed Consolidated Statements of Income false false R5.htm 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income false false R6.htm 1003501 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical Condensed Consolidated Statements of Comprehensive Income (Parenthetical) false false R7.htm 1004000 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.ugi.com/role/CondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows false false R8.htm 2101100 - Disclosure - Nature of Operations Sheet http://www.ugi.com/role/NatureOfOperations Nature of Operations false false R9.htm 2102100 - Disclosure - Significant Accounting Policies Sheet http://www.ugi.com/role/SignificantAccountingPolicies Significant Accounting Policies false false R10.htm 2103100 - Disclosure - Accounting Changes Sheet http://www.ugi.com/role/AccountingChanges Accounting Changes false false R11.htm 2104100 - Disclosure - Segment Information Sheet http://www.ugi.com/role/SegmentInformation Segment Information false false R12.htm 2105100 - Disclosure - Inventories Sheet http://www.ugi.com/role/Inventories Inventories false false R13.htm 2106100 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMatters Regulatory Assets and Liabilities and Regulatory Matters false false R14.htm 2107100 - Disclosure - Defined Benefit Pension and Other Postretirement Plans Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlans Defined Benefit Pension and Other Postretirement Plans false false R15.htm 2109100 - Disclosure - Commitments and Contingencies Sheet http://www.ugi.com/role/CommitmentsAndContingencies Commitments and Contingencies false false R16.htm 2110100 - Disclosure - Related Party Transactions Sheet http://www.ugi.com/role/RelatedPartyTransactions Related Party Transactions false false R17.htm 2111100 - Disclosure - Fair Value Measurements Sheet http://www.ugi.com/role/FairValueMeasurements Fair Value Measurements false false R18.htm 2112100 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivities Disclosures About Derivative Instruments and Hedging Activities false false R19.htm 2202201 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.ugi.com/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) false false R20.htm 2304301 - Disclosure - Segment Information (Tables) Sheet http://www.ugi.com/role/SegmentInformationTables Segment Information (Tables) false false R21.htm 2305301 - Disclosure - Inventories (Tables) Sheet http://www.ugi.com/role/InventoriesTables Inventories (Tables) false false R22.htm 2306301 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters (Tables) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersTables Regulatory Assets and Liabilities and Regulatory Matters (Tables) false false R23.htm 2307301 - Disclosure - Defined Benefit Pension and Other Postretirement Plans (Tables) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansTables Defined Benefit Pension and Other Postretirement Plans (Tables) false false R24.htm 2311301 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.ugi.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) false false R25.htm 2312301 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Tables) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesTables Disclosures About Derivative Instruments and Hedging Activities (Tables) false false R26.htm 2404402 - Disclosure - Segment Information (Details) Sheet http://www.ugi.com/role/SegmentInformationDetails Segment Information (Details) false false R27.htm 2405402 - Disclosure - Inventories (Details) Sheet http://www.ugi.com/role/InventoriesDetails Inventories (Details) false false R28.htm 2405403 - Disclosure - Inventories Textual (Details) Sheet http://www.ugi.com/role/InventoriesTextualDetails Inventories Textual (Details) false false R29.htm 2406402 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters (Details) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersDetails Regulatory Assets and Liabilities and Regulatory Matters (Details) false false R30.htm 2406403 - Disclosure - Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) Sheet http://www.ugi.com/role/RegulatoryAssetsAndLiabilitiesAndRegulatoryMattersTextualDetails Regulatory Assets and Liabilities and Regulatory Matters Textual (Details) false false R31.htm 2407402 - Disclosure - Defined Benefit Pension and Other Postretirement Plans (Details) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansDetails Defined Benefit Pension and Other Postretirement Plans (Details) false false R32.htm 2407403 - Disclosure - Defined Benefit Pension and Other Postretirement Plans Textual (Details) Sheet http://www.ugi.com/role/DefinedBenefitPensionAndOtherPostretirementPlansTextualDetails Defined Benefit Pension and Other Postretirement Plans Textual (Details) false false R33.htm 2409401 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.ugi.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R34.htm 2410401 - Disclosure - Related Party Transactions (Details) Sheet http://www.ugi.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) false false R35.htm 2411402 - Disclosure - Fair Value Measurements (Details) Sheet http://www.ugi.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) false false R36.htm 2411403 - Disclosure - Fair Value Measurements Textual (Details) Sheet http://www.ugi.com/role/FairValueMeasurementsTextualDetails Fair Value Measurements Textual (Details) false false R37.htm 2412402 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities Textual (Details) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesTextualDetails Disclosures About Derivative Instruments and Hedging Activities Textual (Details) false false R38.htm 2412403 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Details) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesDetails Disclosures About Derivative Instruments and Hedging Activities (Details) false false R39.htm 2412404 - Disclosure - Disclosures About Derivative Instruments and Hedging Activities (Details 2) Sheet http://www.ugi.com/role/DisclosuresAboutDerivativeInstrumentsAndHedgingActivitiesDetails2 Disclosures About Derivative Instruments and Hedging Activities (Details 2) false false All Reports Book All Reports Process Flow-Through: 1001000 - Statement - Condensed Consolidated Balance Sheets Process Flow-Through: Removing column 'Sep. 30, 2011' Process Flow-Through: 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Condensed Consolidated Statements of Income Process Flow-Through: 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income Process Flow-Through: 1003501 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical) Process Flow-Through: 1004000 - Statement - Condensed Consolidated Statements of Cash Flows ugu-20121231.xml ugu-20121231.xsd ugu-20121231_cal.xml ugu-20121231_def.xml ugu-20121231_lab.xml ugu-20121231_pre.xml true true