1.0.0.3 false 3000 - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS of CASH FLOWS (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 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 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 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 5 Operating activities 3 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 6 Net income 4 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 357000000 357 false false 2 true true 419000000 419 false false No definition available. No authoritative reference available. false 7 Adjustments to reconcile net income to net cash provided by operating activities 4 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract 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 8 Depreciation, amortization and accretion 5 us-gaap_DepreciationAmortizationAndAccretionNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 576000000 576 false false 2 false true 467000000 467 false false No definition available. No authoritative reference available. false 9 Deferred income taxes and investment tax credits, net 5 us-gaap_DeferredIncomeTaxesAndTaxCredits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 13000000 13 false false 2 false true 98000000 98 false false No definition available. No authoritative reference available. false 10 Deferred fuel cost (credit) 5 pgn_DeferredFuelCostCredit pgn false debit duration monetary The net amount of capitalized fuel costs of a regulated entity that are expected to be recoverable through rate adjustments. false false false false false false false false false 1 false true 129000000 129 false false 2 false true -166000000 -166 false false The net amount of capitalized fuel costs of a regulated entity that are expected to be recoverable through rate adjustments. No authoritative reference available. false 11 Allowance for equity funds used during construction 5 pgn_AllowanceForEquityFundsUsedDuringConstruction pgn false credit duration monetary The adjustment that is the result of a component of the allowance for funds used during construction during the period based... false false false false false false false false false 1 false true -75000000 -75 false false 2 false true -50000000 -50 false false The adjustment that is the result of a component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. As a result of this capitalization, net income is increased. When calculating net cash generated by operating activities, this adjustment must be backed out of net income. No authoritative reference available. false 12 Gain on sale of assets 5 pgn_GainLossOnSaleOfAssets pgn false credit duration monetary The difference between the sale price and the book value of an asset that was sold during the reporting period. This element... false false false false false false false false false 1 false true 0 0 false false 2 false true -71000000 -71 false false The difference between the sale price and the book value of an asset that was sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. No authoritative reference available. false 13 Other adjustments to net income 5 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 118000000 118 false false 2 false true 57000000 57 false false No definition available. No authoritative reference available. false 14 Cash (used) provided by changes in operating assets and liabilities 5 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract 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 Receivables 6 us-gaap_IncreaseDecreaseInReceivables us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -36000000 -36 false false 2 false true 224000000 224 false false No definition available. No authoritative reference available. false 16 Inventory 6 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -118000000 -118 false false 2 false true -116000000 -116 false false No definition available. No authoritative reference available. false 17 Prepayments and other current assets 6 pgn_IncreaseDecreaseInOtherCurrentOperatingAssets pgn false credit duration monetary The net change during the reporting period in other current operating assets not otherwise defined in the taxonomy. false false false false false false false false false 1 false true 48000000 48 false false 2 false true -28000000 -28 false false The net change during the reporting period in other current operating assets not otherwise defined in the taxonomy. No authoritative reference available. false 18 Income taxes, net 6 pgn_CashUsedProvidedByChangesInIncomeTaxesNet pgn false credit duration monetary The net change during the period in the amount of current cash payments due to taxing authorities and due from taxing... false false false false false false false false false 1 false true 110000000 110 false false 2 false true -60000000 -60 false false The net change during the period in the amount of current cash payments due to taxing authorities and due from taxing authorities for taxes that are based on the reporting entity's earnings. No authoritative reference available. false 19 Accounts payable 6 us-gaap_IncreaseDecreaseInAccountsPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -30000000 -30 false false 2 false true 293000000 293 false false No definition available. No authoritative reference available. false 20 Derivative collateral held 6 pgn_IncreaseDecreaseDerivativeCollateralHeld pgn false debit duration monetary The net change during the reporting period in the amount of cash collateral held for derivative instruments in a net asset... false false false false false false false false false 1 false true 0 0 false false 2 false true 312000000 312 false false The net change during the reporting period in the amount of cash collateral held for derivative instruments in a net asset position. No authoritative reference available. false 21 Other current liabilities 6 pgn_IncreaseDecreaseInOtherCurrentOperatingLiabilities pgn false debit duration monetary The net change during the reporting period in other current operating liabilities not otherwise defined in the taxonomy. false false false false false false false false false 1 false true 13000000 13 false false 2 false true 10000000 10 false false The net change during the reporting period in other current operating liabilities not otherwise defined in the taxonomy. No authoritative reference available. false 22 Other assets and deferred debits 6 pgn_IncreaseDecreaseInOtherNoncurrentOperatingAssets pgn false credit duration monetary The net change during the reporting period in other noncurrent operating assets not otherwise defined in the taxonomy. false false false false false false false false false 1 false true 40000000 40 false false 2 false true -33000000 -33 false false The net change during the reporting period in other noncurrent operating assets not otherwise defined in the taxonomy. No authoritative reference available. false 23 Other liabilities and deferred credits 6 pgn_IncreaseDecreaseInOtherNoncurrentOperatingLiabilities pgn false debit duration monetary The net change during the reporting period in other noncurrent operating liabilities not otherwise defined in the taxonomy. false false false false false false false false false 1 false true -50000000 -50 false false 2 false true 1000000 1 false false The net change during the reporting period in other noncurrent operating liabilities not otherwise defined in the taxonomy. No authoritative reference available. false 24 Net cash provided by operating activities 4 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 1095000000 1095 false false 2 false true 1357000000 1357 false false No definition available. No authoritative reference available. true 25 Investing activities 3 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 26 Gross property additions 4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1172000000 -1172 false false 2 false true -1260000000 -1260 false false No definition available. No authoritative reference available. false 27 Nuclear fuel additions 4 us-gaap_PaymentsForProceedsFromNuclearFuel us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -60000000 -60 false false 2 false true -43000000 -43 false false No definition available. No authoritative reference available. false 28 Proceeds from sales of discontinued operations and other assets, net of cash divested 4 pgn_ProceedsFromSalesOfDiscontinuedOperationsAndOtherAssetsNetOfCashDivested pgn false debit duration monetary The cash inflow from the sales of discontinued operations and other assets not otherwise defined in the taxonomy, net of cash... false false false false false false false false false 1 false true 0 0 false false 2 false true 64000000 64 false false The cash inflow from the sales of discontinued operations and other assets not otherwise defined in the taxonomy, net of cash divested. No authoritative reference available. false 29 Purchases of available-for-sale securities and other investments 4 us-gaap_PaymentsToAcquireInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -982000000 -982 false false 2 false true -836000000 -836 false false No definition available. No authoritative reference available. false 30 Proceeds from available-for-sale securities and other investments 4 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 960000000 960 false false 2 false true 816000000 816 false false No definition available. No authoritative reference available. false 31 Other investing activities 4 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -3000000 -3 false false 2 false true -15000000 -15 false false No definition available. No authoritative reference available. false 32 Net cash used by investing activities 4 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1257000000 -1257 false false 2 false true -1274000000 -1274 false false No definition available. No authoritative reference available. true 33 Financing activities 3 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 34 Issuance of common stock 4 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 545000000 545 false false 2 false true 42000000 42 false false No definition available. No authoritative reference available. false 35 Dividends paid on common stock 4 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -347000000 -347 false false 2 false true -320000000 -320 false false No definition available. No authoritative reference available. false 36 Payments of short-term debt with original maturities greater than 90 days 4 us-gaap_RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -29000000 -29 false false 2 false true -176000000 -176 false false No definition available. No authoritative reference available. false 37 Net (decrease) increase in short-term debt 4 us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -621000000 -621 false false 2 false true 318000000 318 false false No definition available. No authoritative reference available. false 38 Proceeds from issuance of long-term debt, net 4 us-gaap_ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1337000000 1337 false false 2 false true 1798000000 1798 false false No definition available. No authoritative reference available. false 39 Retirement of long-term debt 4 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -400000000 -400 false false 2 false true -427000000 -427 false false No definition available. No authoritative reference available. false 40 Cash distributions to noncontrolling interests 4 pgn_CashDistributionsToNoncontrollingInterestsOfConsolidatedSubsidiaries pgn false credit duration monetary The cash outflow to noncontrolled interests that represent returns of capital and returns on capital. false false false false false false false false false 1 false true -4000000 -4 false false 2 false true -85000000 -85 false false The cash outflow to noncontrolled interests that represent returns of capital and returns on capital. No authoritative reference available. false 41 Other financing activities 4 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -47000000 -47 false false 2 false true -65000000 -65 false false No definition available. No authoritative reference available. false 42 Net cash provided by financing activities 4 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 434000000 434 false false 2 false true 1085000000 1085 false false No definition available. No authoritative reference available. true 43 Net increase in cash and cash equivalents 3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 272000000 272 false false 2 false true 1168000000 1168 false false No definition available. No authoritative reference available. true 44 Cash and cash equivalents at beginning of period 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 180000000 180 false false 2 false true 255000000 255 false false No definition available. No authoritative reference available. false 45 Cash and cash equivalents at end of period 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 452000000 452 false false 2 false true 1423000000 1423 false false No definition available. No authoritative reference available. false 47 Significant noncash transactions 4 pgn_SignificantNoncashTransactionsAbstract 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 48 Accrued property additions 5 us-gaap_CapitalExpendituresIncurredButNotYetPaid us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 301000000 301 false false 2 true true 263000000 263 false false No definition available. No authoritative reference available. false false 2 43 false Millions UnKnown UnKnown false true