1.0.0.3 true Statement Of Cash Flows Indirect (USD $) In Millions false 1 $ true false false false us-gaap_ParentCompanyMember dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 false 2 $ true false false false us-gaap_ParentCompanyMember dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 1 PEPCO HOLDINGS INC 0 na true na na na No definition available. false true false false false false 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 2 OPERATING ACTIVITIES 2 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 3 Net income 2 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 70000000 70 false false 2 true true 114000000 114 false false No definition available. No authoritative reference available. false 4 Adjustments to reconcile net income to net cash from operating activities: 2 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 5 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 191000000 191 false false 2 false true 184000000 184 false false No definition available. No authoritative reference available. false 6 Gain on sale of assets 2 us-gaap_GainsLossesOnSalesOfAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. false 7 Effect of settlement of Mirant bankruptcy claims 2 us-gaap_GainLossRelatedToLitigationSettlement us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -14000000 -14 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 8 Non-cash rents received from cross-border energy lease investments under income earned 2 pom_NetAmountOfNoncashLeaseEarrnings pom false credit duration monetary No definition available. false false false false false false false false false 1 false true -27000000 -27 false false 2 false true -37000000 -37 false false No definition available. No authoritative reference available. false 9 Non-cash charge to reduce equity value of PHI's cross-border energy lease investments 2 pom_NoncashChargeToReduceEquityValueOfLeaseInvestments pom false credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 124000000 124 false false No definition available. No authoritative reference available. false 10 Changes in restricted cash equivalents related to Mirant settlement 2 us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 11 Deferred income taxes 2 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 82000000 82 false false 2 false true 1000000 1 false false No definition available. No authoritative reference available. false 12 Net unrealized losses (gains) on commodity derivatives accounted for at fair value 2 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 49000000 49 false false 2 false true -31000000 -31 false false No definition available. No authoritative reference available. false 13 Changes in: 2 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 14 Accounts receivable 2 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 224000000 224 false false 2 false true -201000000 -201 false false No definition available. No authoritative reference available. false 15 Inventories 2 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 23000000 23 false false 2 false true -58000000 -58 false false No definition available. No authoritative reference available. false 16 Prepaid expenses 2 us-gaap_IncreaseDecreaseInPrepaidExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -59000000 -59 false false 2 false true -47000000 -47 false false No definition available. No authoritative reference available. false 17 Regulatory assets and liabilities 2 us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -82000000 -82 false false 2 false true -9000000 -9 false false No definition available. No authoritative reference available. false 18 Accounts payable and accrued liabilities 2 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -241000000 -241 false false 2 false true 229000000 229 false false No definition available. No authoritative reference available. false 19 Pension contributions 2 us-gaap_PensionContributions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -220000000 -220 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 21 Pension and other postretirement benefit obligations, excluding contributions 2 us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 63000000 63 false false 2 false true 16000000 16 false false No definition available. No authoritative reference available. false 22 Cash collateral related to derivative activities 2 pom_CashCollateralRelatedToDerivativeActivities pom false credit duration monetary No definition available. false false false false false false false false false 1 false true -104000000 -104 false false 2 false true 395000000 395 false false No definition available. No authoritative reference available. false 23 Taxes accrued 2 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 19000000 19 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 24 Interest accrued 2 us-gaap_IncreaseDecreaseInInterestPayableNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2 false false 2 false true -1000000 -1 false false No definition available. No authoritative reference available. false 25 Other assets and liabilities 2 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 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 7000000 7 false false No definition available. No authoritative reference available. false 26 Net Cash (Used By) From Operating Activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 7000000 7 false false 2 false true 693000000 693 false false No definition available. No authoritative reference available. true 27 INVESTING ACTIVITIES 2 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 28 Investment in property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -388000000 -388 false false 2 false true -366000000 -366 false false No definition available. No authoritative reference available. false 29 Proceeds from sale of assets 2 us-gaap_ProceedsFromSaleOfProductiveAssets us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 51000000 51 false false No definition available. No authoritative reference available. false 30 Changes in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false true -48000000 -48 false false No definition available. No authoritative reference available. false 31 Net other investing activities 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 5000000 5 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 32 Net Cash Used By Investing Activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -382000000 -382 false false 2 false true -361000000 -361 false false No definition available. No authoritative reference available. true 33 FINANCING ACTIVITIES 2 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 Dividends paid 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -119000000 -119 false false 2 false true -109000000 -109 false false No definition available. No authoritative reference available. false 36 Common stock issued for the Dividend Reinvestment Plan 2 pom_ProceedsFromStockIssuedToTheDividendReinvestmentPlan pom false debit duration monetary No definition available. false false false false false false false false false 1 false true 15000000 15 false false 2 false true 14000000 14 false false No definition available. No authoritative reference available. false 37 Issuances of common stock 2 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 11000000 11 false false 2 false true 15000000 15 false false No definition available. No authoritative reference available. false 38 Issuance of long-term debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 110000000 110 false false 2 false true 400000000 400 false false No definition available. No authoritative reference available. false 39 Reacquisition of long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -67000000 -67 false false 2 false true -405000000 -405 false false No definition available. No authoritative reference available. false 40 Issuances (repayments) of short-term debt, net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 175000000 175 false false 2 false true 20000000 20 false false No definition available. No authoritative reference available. false 41 Cost of issuances 2 us-gaap_PaymentOfFinancingAndStockIssuanceCosts us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -4000000 -4 false false 2 false true -11000000 -11 false false No definition available. No authoritative reference available. false 42 Net other financing activities 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -10000000 -10 false false 2 false true -20000000 -20 false false No definition available. No authoritative reference available. false 43 Net Cash From (Used By) Financing Activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 111000000 111 false false 2 false true -96000000 -96 false false No definition available. No authoritative reference available. true 44 Net (Decrease) Increase in Cash and Cash Equivalents 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -264000000 -264 false false 2 false true 236000000 236 false false No definition available. No authoritative reference available. true 45 Cash and Cash Equivalents at Beginning of Period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 384000000 384 false false 2 false true 55000000 55 false false No definition available. No authoritative reference available. false 46 CASH AND CASH EQUIVALENTS AT END OF PERIOD 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 120000000 120 false false 2 false true 291000000 291 false false No definition available. No authoritative reference available. false 47 NONCASH ACTIVITIES 2 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 48 Asset retirement obligations associated with removal costs transferred to regulatory liabilities 2 pom_NoncashTransferOfAssetRetirementObligations pom false credit duration monetary No definition available. false false false false false false false false false 1 false true 6000000 6 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 49 Recoverable pension/other postretirement benefit costs included in regulatory assets 2 pom_SupplementalOtherCashPayments pom false debit duration monetary No definition available. false false false false false false false false false 1 false true -24000000 -24 false false 2 false true 95000000 95 false false No definition available. No authoritative reference available. false 50 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION 2 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 51 Cash (received) paid for income taxes, net 2 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -66000000 -66 false false 2 false true 76000000 76 false false No definition available. No authoritative reference available. false 52 POTOMAC ELECTRIC POWER CO 0 na true na na na No definition available. false true false false false false 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 53 OPERATING ACTIVITIES 2 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 54 Net income 2 us-gaap_NetIncomeLoss 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 46000000 46 false false No definition available. No authoritative reference available. false 55 Adjustments to reconcile net income to net cash from operating activities: 2 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 56 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 72000000 72 false false 2 false true 69000000 69 false false No definition available. No authoritative reference available. false 58 Effect of settlement of Mirant bankruptcy claims 2 us-gaap_GainLossRelatedToLitigationSettlement us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -14000000 -14 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 61 Changes in restricted cash equivalents related to Mirant settlement 2 us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 62 Deferred income taxes 2 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 18000000 18 false false 2 false true 37000000 37 false false No definition available. No authoritative reference available. false 64 Changes in: 2 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 65 Accounts receivable 2 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 18000000 18 false false 2 false true -22000000 -22 false false No definition available. No authoritative reference available. false 68 Regulatory assets and liabilities 2 us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -11000000 -11 false false 2 false true -33000000 -33 false false No definition available. No authoritative reference available. false 69 Accounts payable and accrued liabilities 2 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -40000000 -40 false false 2 false true 53000000 53 false false No definition available. No authoritative reference available. false 70 Pension contributions 2 us-gaap_PensionContributions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -150000000 -150 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 74 Taxes accrued 2 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 91000000 91 false false 2 false true -15000000 -15 false false No definition available. No authoritative reference available. false 75 Interest accrued 2 us-gaap_IncreaseDecreaseInInterestPayableNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1000000 -1 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 76 Other assets and liabilities 2 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 19000000 19 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 77 Net Cash (Used By) From Operating Activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 76000000 76 false false 2 false true 145000000 145 false false No definition available. No authoritative reference available. true 78 INVESTING ACTIVITIES 2 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 79 Investment in property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -130000000 -130 false false 2 false true -121000000 -121 false false No definition available. No authoritative reference available. false 81 Changes in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -17000000 -17 false false No definition available. No authoritative reference available. false 82 Net other investing activities 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 83 Net Cash Used By Investing Activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -129000000 -129 false false 2 false true -138000000 -138 false false No definition available. No authoritative reference available. true 84 FINANCING ACTIVITIES 2 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 85 Dividends paid 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -20000000 -20 false false No definition available. No authoritative reference available. false 86 Capital contribution from Parent 2 us-gaap_ProceedsFromContributionsFromParent us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 50000000 50 false false 2 false true 78000000 78 false false No definition available. No authoritative reference available. false 89 Issuance of long-term debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 110000000 110 false false 2 false true 250000000 250 false false No definition available. No authoritative reference available. false 90 Reacquisition of long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -50000000 -50 false false 2 false true -188000000 -188 false false No definition available. No authoritative reference available. false 91 Issuances (repayments) of short-term debt, net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -125000000 -125 false false 2 false true -114000000 -114 false false No definition available. No authoritative reference available. false 93 Net other financing activities 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -9000000 -9 false false 2 false true -16000000 -16 false false No definition available. No authoritative reference available. false 94 Net Cash From (Used By) Financing Activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -24000000 -24 false false 2 false true -10000000 -10 false false No definition available. No authoritative reference available. true 95 Net (Decrease) Increase in Cash and Cash Equivalents 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -77000000 -77 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. true 96 Cash and Cash Equivalents at Beginning of Period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 146000000 146 false false 2 false true 19000000 19 false false No definition available. No authoritative reference available. false 97 CASH AND CASH EQUIVALENTS AT END OF PERIOD 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 69000000 69 false false 2 false true 16000000 16 false false No definition available. No authoritative reference available. false 98 NONCASH ACTIVITIES 2 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 99 Asset retirement obligations associated with removal costs transferred to regulatory liabilities 2 pom_NoncashTransferOfAssetRetirementObligations pom false 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 5000000 5 false false No definition available. No authoritative reference available. false 101 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION 2 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 102 Cash (received) paid for income taxes, net 2 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -86000000 -86 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 103 DELMARVA POWER & LIGHT CO /DE/ 0 na true na na na No definition available. false true false false false false 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 104 OPERATING ACTIVITIES 2 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 105 Net income 2 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 26000000 26 false false 2 false true 42000000 42 false false No definition available. No authoritative reference available. false 106 Adjustments to reconcile net income to net cash from operating activities: 2 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 107 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 37000000 37 false false 2 false true 36000000 36 false false No definition available. No authoritative reference available. false 108 Gain on sale of assets 2 us-gaap_GainsLossesOnSalesOfAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. false 113 Deferred income taxes 2 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 22000000 22 false false 2 false true 31000000 31 false false No definition available. No authoritative reference available. false 115 Changes in: 2 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 116 Accounts receivable 2 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 28000000 28 false false 2 false true -18000000 -18 false false No definition available. No authoritative reference available. false 117 Inventories 2 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 11000000 11 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 119 Regulatory assets and liabilities 2 us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 21000000 21 false false No definition available. No authoritative reference available. false 120 Accounts payable and accrued liabilities 2 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 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 31000000 31 false false No definition available. No authoritative reference available. false 121 Pension contributions 2 us-gaap_PensionContributions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -10000000 -10 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 125 Taxes accrued 2 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -35000000 -35 false false 2 false true -21000000 -21 false false No definition available. No authoritative reference available. false 127 Other assets and liabilities 2 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 12000000 12 false false 2 false true 4000000 4 false false No definition available. No authoritative reference available. false 128 Net Cash (Used By) From Operating Activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 82000000 82 false false 2 false true 128000000 128 false false No definition available. No authoritative reference available. true 129 INVESTING ACTIVITIES 2 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 130 Investment in property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -84000000 -84 false false 2 false true -72000000 -72 false false No definition available. No authoritative reference available. false 131 Proceeds from sale of assets 2 us-gaap_ProceedsFromSaleOfProductiveAssets us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 50000000 50 false false No definition available. No authoritative reference available. false 132 Changes in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -32000000 -32 false false No definition available. No authoritative reference available. false 134 Net Cash Used By Investing Activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -84000000 -84 false false 2 false true -54000000 -54 false false No definition available. No authoritative reference available. true 135 FINANCING ACTIVITIES 2 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 136 Dividends paid 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -28000000 -28 false false 2 false true -42000000 -42 false false No definition available. No authoritative reference available. false 137 Capital contribution from Parent 2 us-gaap_ProceedsFromContributionsFromParent us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 62000000 62 false false No definition available. No authoritative reference available. false 140 Issuance of long-term debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 150000000 150 false false No definition available. No authoritative reference available. false 141 Reacquisition of long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -98000000 -98 false false No definition available. No authoritative reference available. false 142 Issuances (repayments) of short-term debt, net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 9000000 9 false false 2 false true -147000000 -147 false false No definition available. No authoritative reference available. false 144 Net other financing activities 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. false 145 Net Cash From (Used By) Financing Activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -21000000 -21 false false 2 false true -78000000 -78 false false No definition available. No authoritative reference available. true 146 Net (Decrease) Increase in Cash and Cash Equivalents 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -23000000 -23 false false 2 false true -4000000 -4 false false No definition available. No authoritative reference available. true 147 Cash and Cash Equivalents at Beginning of Period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 138000000 138 false false 2 false true 11000000 11 false false No definition available. No authoritative reference available. false 148 CASH AND CASH EQUIVALENTS AT END OF PERIOD 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 115000000 115 false false 2 false true 7000000 7 false false No definition available. No authoritative reference available. false 149 NONCASH ACTIVITIES 2 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 150 Asset retirement obligations associated with removal costs transferred to regulatory liabilities 2 pom_NoncashTransferOfAssetRetirementObligations pom false 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 -3000000 -3 false false No definition available. No authoritative reference available. false 152 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION 2 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 153 Cash (received) paid for income taxes, net 2 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 28000000 28 false false 2 false true 11000000 11 false false No definition available. No authoritative reference available. false 154 ATLANTIC CITY ELECTRIC CO 0 na true na na na No definition available. false true false false false false 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 155 OPERATING ACTIVITIES 2 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 156 Net income 2 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 10000000 10 false false 2 false true 32000000 32 false false No definition available. No authoritative reference available. false 157 Adjustments to reconcile net income to net cash from operating activities: 2 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 158 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 49000000 49 false false 2 false true 49000000 49 false false No definition available. No authoritative reference available. false 164 Deferred income taxes 2 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 23000000 23 false false 2 false true 34000000 34 false false No definition available. No authoritative reference available. false 166 Changes in: 2 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 167 Accounts receivable 2 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 32000000 32 false false 2 false true -24000000 -24 false false No definition available. No authoritative reference available. false 170 Regulatory assets and liabilities 2 us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -109000000 -109 false false 2 false true 4000000 4 false false No definition available. No authoritative reference available. false 171 Accounts payable and accrued liabilities 2 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2000000 2 false false 2 false true 117000000 117 false false No definition available. No authoritative reference available. false 172 Pension contributions 2 us-gaap_PensionContributions 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 0 0 false false No definition available. No authoritative reference available. false 173 Prepaid New Jersey sales and excise tax 2 us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -58000000 -58 false false 2 false true -54000000 -54 false false No definition available. No authoritative reference available. false 176 Taxes accrued 2 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -3000000 -3 false false 2 false true -27000000 -27 false false No definition available. No authoritative reference available. false 177 Interest accrued 2 us-gaap_IncreaseDecreaseInInterestPayableNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -2000000 -2 false false No definition available. No authoritative reference available. false 178 Other assets and liabilities 2 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 6000000 6 false false 2 false true 4000000 4 false false No definition available. No authoritative reference available. false 179 Net Cash (Used By) From Operating Activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -108000000 -108 false false 2 false true 133000000 133 false false No definition available. No authoritative reference available. true 180 INVESTING ACTIVITIES 2 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 181 Investment in property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -67000000 -67 false false 2 false true -89000000 -89 false false No definition available. No authoritative reference available. false 182 Proceeds from sale of assets 2 us-gaap_ProceedsFromSaleOfProductiveAssets us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 1000000 1 false false No definition available. No authoritative reference available. false 184 Net other investing activities 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 185 Net Cash Used By Investing Activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -66000000 -66 false false 2 false true -86000000 -86 false false No definition available. No authoritative reference available. true 186 FINANCING ACTIVITIES 2 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 187 Dividends paid 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -24000000 -24 false false 2 false true -31000000 -31 false false No definition available. No authoritative reference available. false 188 Capital contribution from Parent 2 us-gaap_ProceedsFromContributionsFromParent us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 40000000 40 false false 2 false true 35000000 35 false false No definition available. No authoritative reference available. false 192 Reacquisition of long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -15000000 -15 false false 2 false true -119000000 -119 false false No definition available. No authoritative reference available. false 193 Issuances (repayments) of short-term debt, net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 116000000 116 false false 2 false true 78000000 78 false false No definition available. No authoritative reference available. false 195 Net other financing activities 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -3000000 -3 false false 2 false true -8000000 -8 false false No definition available. No authoritative reference available. false 196 Net Cash From (Used By) Financing Activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 114000000 114 false false 2 false true -45000000 -45 false false No definition available. No authoritative reference available. true 197 Net (Decrease) Increase in Cash and Cash Equivalents 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -60000000 -60 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. true 198 Cash and Cash Equivalents at Beginning of Period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 65000000 65 false false 2 false true 7000000 7 false false No definition available. No authoritative reference available. false 199 CASH AND CASH EQUIVALENTS AT END OF PERIOD 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 5000000 5 false false 2 false true 9000000 9 false false No definition available. No authoritative reference available. false 203 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION 2 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 204 Cash (received) paid for income taxes, net 2 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true -16000000 -16 false false 2 true true 7000000 7 false false No definition available. No authoritative reference available. false false 2 155 false Millions UnKnown UnKnown false true