1.0.0.3 false 2000 - UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions false 1 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 6 Utility plant 4 pgn_UtilityPlantAbstract pgn false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 7 Utility plant in service 5 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 true true 27822000000 27822 false false 2 true true 26326000000 26326 false false No definition available. No authoritative reference available. false 8 Accumulated depreciation 5 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true -11396000000 -11396 false false 2 false true -11298000000 -11298 false false No definition available. No authoritative reference available. false 9 Utility plant in service, net 5 pgn_UtilityPlantInServiceNet pgn false debit instant monetary Period end amount of total gross PPE less the period end book value of accumulated depreciation on property, plant and... false false false false false false false false false 1 false true 16426000000 16426 false false 2 false true 15028000000 15028 false false Period end amount of total gross PPE less the period end book value of accumulated depreciation on property, plant and equipment that is owned by the regulated operations of the public utility. No authoritative reference available. true 10 Held for future use 5 pgn_PlantHeldForFutureUse pgn false debit instant monetary Period end amount of plants held for future use. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 38000000 38 false false Period end amount of plants held for future use. No authoritative reference available. false 11 Construction work in progress 5 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 2024000000 2024 false false 2 false true 2745000000 2745 false false No definition available. No authoritative reference available. false 12 Nuclear fuel, net of amortization 5 us-gaap_NuclearFuelNetOfAmortization us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 486000000 486 false false 2 false true 482000000 482 false false No definition available. No authoritative reference available. false 13 Total utility plant, net 5 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 18974000000 18974 false false 2 false true 18293000000 18293 false false No definition available. No authoritative reference available. true 14 Current assets 4 us-gaap_AssetsCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 15 Cash and cash equivalents 5 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 452000000 452 false false 2 false true 180000000 180 false false No definition available. No authoritative reference available. false 16 Receivables, net 5 us-gaap_ReceivablesNetCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 882000000 882 false false 2 false true 867000000 867 false false No definition available. No authoritative reference available. false 17 Inventory 5 us-gaap_PublicUtilitiesInventory us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1353000000 1353 false false 2 false true 1239000000 1239 false false No definition available. No authoritative reference available. false 18 Regulatory assets 5 us-gaap_RegulatoryAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 426000000 426 false false 2 false true 533000000 533 false false No definition available. No authoritative reference available. false 19 Derivative collateral posted 5 us-gaap_CollateralAlreadyPostedAggregateFairValue us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 302000000 302 false false 2 false true 353000000 353 false false No definition available. No authoritative reference available. false 20 Income taxes receivable 5 us-gaap_IncomeTaxesReceivable us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 72000000 72 false false 2 false true 194000000 194 false false No definition available. No authoritative reference available. false 21 Prepayments and other current assets 5 us-gaap_OtherAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 218000000 218 false false 2 false true 154000000 154 false false No definition available. No authoritative reference available. false 22 Total current assets 5 us-gaap_AssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 3705000000 3705 false false 2 false true 3520000000 3520 false false No definition available. No authoritative reference available. true 23 Deferred debits and other assets 4 us-gaap_AssetsNoncurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 24 Regulatory assets 5 us-gaap_RegulatoryAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 2623000000 2623 false false 2 false true 2567000000 2567 false false No definition available. No authoritative reference available. false 25 Nuclear decommissioning trust funds 5 us-gaap_DecommissioningFundInvestments us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1160000000 1160 false false 2 false true 1089000000 1089 false false No definition available. No authoritative reference available. false 26 Miscellaneous other property and investments 5 pgn_MiscellaneousOtherPropertyAndInvestments pgn false debit instant monetary This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy... false false false false false false false false false 1 false true 450000000 450 false false 2 false true 446000000 446 false false This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy and other noncurrent investments not otherwise specified in the taxonomy. No authoritative reference available. false 27 Goodwill 5 us-gaap_Goodwill us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 3655000000 3655 false false 2 false true 3655000000 3655 false false No definition available. No authoritative reference available. false 28 Other assets and deferred debits 5 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 307000000 307 false false 2 false true 303000000 303 false false No definition available. No authoritative reference available. false 29 Total deferred debits and other assets 5 us-gaap_AssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 8195000000 8195 false false 2 false true 8060000000 8060 false false No definition available. No authoritative reference available. true 30 Total assets 4 us-gaap_Assets us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 30874000000 30874 false false 2 false true 29873000000 29873 false false No definition available. No authoritative reference available. true 32 Common stock equity 4 pgn_CommonStockEquityAbstract pgn false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 33 Common stock without par value, 500 million shares authorized, 279 million and 264 million shares issued and outstanding, respectively 5 us-gaap_CommonStockValue us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 6776000000 6776 false false 2 false true 6206000000 6206 false false No definition available. No authoritative reference available. false 34 Unearned ESOP shares (1 million shares) 5 pgn_UnearnedEmployeeStockOwnershipPlanShares pgn false credit instant monetary Fair value of unearned shares, at the time transferred to the trust, for all classes of common stockh held by an employee... false false false false false false false false false 1 false true -12000000 -12 false false 2 false true -25000000 -25 false false Fair value of unearned shares, at the time transferred to the trust, for all classes of common stockh held by an employee stock ownership plan (ESOP). Includes the sale of shares or the issuance treasury shares to an ESOP. No authoritative reference available. false 35 Accumulated other comprehensive loss 5 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true -96000000 -96 false false 2 false true -116000000 -116 false false No definition available. No authoritative reference available. false 36 Retained earnings 5 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2621000000 2621 false false 2 false true 2622000000 2622 false false No definition available. No authoritative reference available. false 37 Total common stock equity 5 pgn_TotalCommonStockEquity pgn false credit instant monetary The amount of stockholders' equity attributable to common stock. false false false false false false false false false 1 false true 9289000000 9289 false false 2 false true 8687000000 8687 false false The amount of stockholders' equity attributable to common stock. No authoritative reference available. true 38 Noncontrolling interests 4 us-gaap_MinorityInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 6000000 6 false false 2 false true 6000000 6 false false No definition available. No authoritative reference available. false 39 Total equity 4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 9295000000 9295 false false 2 false true 8693000000 8693 false false No definition available. No authoritative reference available. true 40 Preferred stock of subsidiaries 4 pgn_NoncontrollingInterestAmountRepresentedByTemporaryEquity pgn false credit instant monetary The amount of noncontrolling interest in subsidiary represented by preferred securities issued by the subsidiary. The... false false false false false false false false false 1 false true 93000000 93 false false 2 false true 93000000 93 false false The amount of noncontrolling interest in subsidiary represented by preferred securities issued by the subsidiary. The preferred securities are not permanent equity but rather temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. No authoritative reference available. false 41 Long-term debt, affiliate 4 us-gaap_NotesPayableRelatedPartiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 272000000 272 false false 2 false true 272000000 272 false false No definition available. No authoritative reference available. false 42 Long-term debt, net 4 us-gaap_LongTermDebtNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 10834000000 10834 false false 2 false true 10387000000 10387 false false No definition available. No authoritative reference available. false 43 Total capitalization 4 us-gaap_CapitalizationLongtermDebtAndEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 20494000000 20494 false false 2 false true 19445000000 19445 false false No definition available. No authoritative reference available. false 44 Current liabilities 4 us-gaap_LiabilitiesCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 45 Current portion of long-term debt 5 us-gaap_LongTermDebtCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 400000000 400 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 46 Short-term debt 5 us-gaap_ShortTermBorrowings us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 500000000 500 false false 2 false true 1050000000 1050 false false No definition available. No authoritative reference available. false 47 Accounts payable 5 us-gaap_AccountsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 853000000 853 false false 2 false true 912000000 912 false false No definition available. No authoritative reference available. false 48 Interest accrued 5 us-gaap_InterestPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 181000000 181 false false 2 false true 167000000 167 false false No definition available. No authoritative reference available. false 49 Dividends declared 5 us-gaap_DividendsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 174000000 174 false false 2 false true 164000000 164 false false No definition available. No authoritative reference available. false 50 Customer deposits 5 us-gaap_CustomerDepositsCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 290000000 290 false false 2 false true 282000000 282 false false No definition available. No authoritative reference available. false 51 Derivative liabilities 5 pgn_CurrentDerivativeLiabilities pgn false credit instant monetary Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being... false false false false false false false false false 1 false true 409000000 409 false false 2 false true 493000000 493 false false Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer. No authoritative reference available. false 52 Other current liabilities 5 us-gaap_OtherLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 411000000 411 false false 2 false true 418000000 418 false false No definition available. No authoritative reference available. false 53 Total current liabilities 5 us-gaap_LiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 3218000000 3218 false false 2 false true 3486000000 3486 false false No definition available. No authoritative reference available. true 54 Deferred credits and other liabilities 4 us-gaap_LiabilitiesNoncurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 55 Noncurrent income tax liabilities 5 pgn_NoncurrentIncomeTaxLiabilities pgn false credit instant monetary Represents the noncurrent portion of deferred tax liabilities and the noncurrent portion of uncertain tax positions as of the... false false false false false false false false false 1 false true 941000000 941 false false 2 false true 818000000 818 false false Represents the noncurrent portion of deferred tax liabilities and the noncurrent portion of uncertain tax positions as of the balance sheet date. Deferred tax liabilities result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. No authoritative reference available. false 56 Accumulated deferred investment tax credits 5 us-gaap_AccumulatedDeferredInvestmentTaxCredit us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 122000000 122 false false 2 false true 127000000 127 false false No definition available. No authoritative reference available. false 57 Regulatory liabilities 5 us-gaap_RegulatoryLiabilityNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2276000000 2276 false false 2 false true 2181000000 2181 false false No definition available. No authoritative reference available. false 58 Asset retirement obligations 5 us-gaap_AssetRetirementObligationsNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1518000000 1518 false false 2 false true 1471000000 1471 false false No definition available. No authoritative reference available. false 59 Accrued pension and other benefits 5 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1602000000 1602 false false 2 false true 1594000000 1594 false false No definition available. No authoritative reference available. false 60 Capital lease obligations 5 us-gaap_CapitalLeaseObligationsNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 227000000 227 false false 2 false true 231000000 231 false false No definition available. No authoritative reference available. false 61 Derivative liabilities 5 pgn_NoncurrentDerivativeLiabilities pgn false credit instant monetary Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being... false false false false false false false false false 1 false true 244000000 244 false false 2 false true 269000000 269 false false Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer. No authoritative reference available. false 62 Other liabilities and deferred credits 5 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 232000000 232 false false 2 false true 251000000 251 false false No definition available. No authoritative reference available. false 63 Total deferred credits and other liabilities 5 pgn_TotalDeferredCreditsAndOtherLiabilities pgn false credit instant monetary Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or... false false false false false false false false false 1 false true 7162000000 7162 false false 2 false true 6942000000 6942 false false Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle excluding long-term debt, net and long-term debt, affiliate. No authoritative reference available. true 64 Commitments and contingencies (Notes 14 and 15) 4 us-gaap_CommitmentsAndContingencies2009 us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. No authoritative reference available. false 65 Total capitalization and liabilities 4 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 true true 30874000000 30874 false false 2 true true 29873000000 29873 false false No definition available. No authoritative reference available. true false 2 59 false Millions UnKnown UnKnown false true