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Excludes amortization of nuclear fuel. No authoritative reference available. false 15 Taxes other than income taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 214066000 214066 false false false 2 false true false false 208089000 208089 false false false 3 false true false false 426261000 426261 false false false 4 false true false false 407969000 407969 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. true 16 Total operating expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 3256368000 3256368 false false false 2 false true false false 2998970000 2998970 false false false 3 false true false false 6491691000 6491691 false false false 4 false true false false 6175600000 6175600 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 17 Operating Income 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 951051000 951051 false false false 2 false true false false 886194000 886194 false false false 3 false true false false 1873045000 1873045 false false false 4 false true false false 1375871000 1375871 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. 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