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 194000000 194 false false 2 true true 233000000 233 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_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 294000000 294 false false 2 false true 283000000 283 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 -40000000 -40 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 8 Non-cash rents from cross-border energy lease investments 2 pom_NetAmountOfNoncashLeaseEarrnings pom false credit duration monetary Net amount of non-cash lease earnings recorded for the period and actual cash received on the leases during the period. false false false false false false false false false 1 false true -41000000 -41 false false 2 false true -51000000 -51 false false Net amount of non-cash lease earnings recorded for the period and actual cash received on the leases during the period. 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 Noncash charge to reduce equity value of PHI's cross border energy lease investments. false false false false false false false false false 1 false true 0 0 false false 2 false true 124000000 124 false false Noncash charge to reduce equity value of PHI's cross border energy lease investments. 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 102000000 102 false false 2 false true 317000000 317 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 250000000 250 false false 2 false true 31000000 31 false false No definition available. No authoritative reference available. false 12 Net unrealized losses (gains) on commodity derivatives accounted for as fair value hedges 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 57000000 57 false false 2 false true -26000000 -26 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 177000000 177 false false 2 false true -130000000 -130 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 24000000 24 false false 2 false true -72000000 -72 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 -31000000 -31 false false 2 false true -37000000 -37 false false No definition available. No authoritative reference available. false 17 Regulatory assets and liabilities, net 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 -157000000 -157 false false 2 false true -284000000 -284 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 -261000000 -261 false false 2 false true 87000000 87 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 -300000000 -300 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 20 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 94000000 94 false false 2 false true 21000000 21 false false No definition available. No authoritative reference available. false 21 Cash collateral related to derivative activities 2 pom_CashCollateralRelatedToDerivativeActivities pom false credit duration monetary Change in cash collateral posted or held related to deriviative activities. false false false false false false false false false 1 false true 4000000 4 false false 2 false true -88000000 -88 false false Change in cash collateral posted or held related to deriviative activities. No authoritative reference available. false 22 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 -74000000 -74 false false 2 false true 60000000 60 false false No definition available. No authoritative reference available. false 23 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 22000000 22 false false 2 false true 10000000 10 false false No definition available. No authoritative reference available. false 24 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 -6000000 -6 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 308000000 308 false false 2 false true 469000000 469 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 -595000000 -595 false false 2 false true -561000000 -561 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 4000000 4 false false 2 false true 52000000 52 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 -31000000 -31 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 2000000 2 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 -590000000 -590 false false 2 false true -538000000 -538 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 on common stock 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 -178000000 -178 false false 2 false true -163000000 -163 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 Cash inflow associated with the amount received from the stock issued during the period from the dividend reinvestment plan. false false false false false false false false false 1 false true 23000000 23 false false 2 false true 25000000 25 false false Cash inflow associated with the amount received from the stock issued during the period from the dividend reinvestment plan. 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 14000000 14 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 -75000000 -75 false false 2 false true -438000000 -438 false false No definition available. No authoritative reference available. false 40 Issuances 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 28000000 28 false false 2 false true 441000000 441 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 -13000000 -13 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 0 0 false false 2 false true -26000000 -26 false false No definition available. No authoritative reference available. false 43 Net Cash (Used By) From 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 -82000000 -82 false false 2 false true 241000000 241 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 -364000000 -364 false false 2 false true 172000000 172 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 20000000 20 false false 2 false true 227000000 227 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 The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. false false false false false false false false false 1 false true 9000000 9 false false 2 false true 5000000 5 false false The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. No authoritative reference available. false 49 Recoverable pension/other postretirement benefit costs included in regulatory assets 2 pom_SupplementalOtherCashPayments pom false debit duration monetary The non-cash reclass of recoverable pension/OPEB costs to regulatory assets. false false false false false false false false false 1 false true -41000000 -41 false false 2 false true 90000000 90 false false The non-cash reclass of recoverable pension/OPEB costs to regulatory assets. No authoritative reference available. false 50 Conversion of DPL long-term debt to short-term debt 2 pom_ConversionOfConvertibleNote pom false credit duration monetary The non-cash conversion of long term debt into short term debt. false false false false false false false false false 1 false true 0 0 false false 2 false true 150000000 150 false false The non-cash conversion of long term debt into short term debt. No authoritative reference available. false 51 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 52 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 -74000000 -74 false false 2 false true 83000000 83 false false No definition available. No authoritative reference available. false 53 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 54 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 55 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 94000000 94 false false 2 false true 92000000 92 false false No definition available. No authoritative reference available. false 56 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 57 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 108000000 108 false false 2 false true 105000000 105 false false No definition available. No authoritative reference available. false 59 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 -40000000 -40 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 62 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 102000000 102 false false 2 false true 317000000 317 false false No definition available. No authoritative reference available. false 63 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 101000000 101 false false 2 false true 60000000 60 false false No definition available. No authoritative reference available. false 65 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 66 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 -12000000 -12 false false 2 false true -61000000 -61 false false No definition available. No authoritative reference available. false 69 Regulatory assets and liabilities, net 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 -55000000 -55 false false 2 false true -315000000 -315 false false No definition available. No authoritative reference available. false 70 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 -25000000 -25 false false 2 false true 14000000 14 false false No definition available. No authoritative reference available. false 71 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 -170000000 -170 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 56000000 56 false false 2 false true -31000000 -31 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 18000000 18 false false 2 false true 16000000 16 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 5000000 5 false false 2 false true -5000000 -5 false false No definition available. No authoritative reference available. false 78 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 182000000 182 false false 2 false true 192000000 192 false false No definition available. No authoritative reference available. true 79 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 80 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 -196000000 -196 false false 2 false true -202000000 -202 false false No definition available. No authoritative reference available. false 82 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 -20000000 -20 false false No definition available. No authoritative reference available. false 83 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 -3000000 -3 false false 2 false true -1000000 -1 false false No definition available. No authoritative reference available. false 84 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 -199000000 -199 false false 2 false true -223000000 -223 false false No definition available. No authoritative reference available. true 85 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 86 Dividends paid on common stock 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 -64000000 -64 false false No definition available. No authoritative reference available. false 87 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 94000000 94 false false 2 false true 78000000 78 false false No definition available. No authoritative reference available. false 90 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 91 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 92 Issuances 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 -12000000 -12 false false No definition available. No authoritative reference available. false 94 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 -4000000 -4 false false 2 false true -13000000 -13 false false No definition available. No authoritative reference available. false 95 Net Cash (Used By) From 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 25000000 25 false false 2 false true 51000000 51 false false No definition available. No authoritative reference available. true 96 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 8000000 8 false false 2 false true 20000000 20 false false No definition available. No authoritative reference available. true 97 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 98 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 154000000 154 false false 2 false true 39000000 39 false false No definition available. No authoritative reference available. false 99 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 100 Asset retirement obligations associated with removal costs transferred to regulatory liabilities 2 pom_NoncashTransferOfAssetRetirementObligations pom false credit duration monetary The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. false false false false false false false false false 1 false true 4000000 4 false false 2 false true 6000000 6 false false The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. No authoritative reference available. false 103 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 104 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 41000000 41 false false No definition available. No authoritative reference available. false 105 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 106 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 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 40000000 40 false false 2 false true 53000000 53 false false No definition available. No authoritative reference available. false 108 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 109 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 56000000 56 false false 2 false true 54000000 54 false false No definition available. No authoritative reference available. false 110 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 115 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 50000000 50 false false 2 false true 41000000 41 false false No definition available. No authoritative reference available. false 117 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 118 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 31000000 31 false false 2 false true -25000000 -25 false false No definition available. No authoritative reference available. false 119 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 6000000 6 false false 2 false true -7000000 -7 false false No definition available. No authoritative reference available. false 121 Regulatory assets and liabilities, net 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 32000000 32 false false No definition available. No authoritative reference available. false 122 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 -38000000 -38 false false 2 false true -21000000 -21 false false No definition available. No authoritative reference available. false 123 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 126 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 -57000000 -57 false false 2 false true -25000000 -25 false false No definition available. No authoritative reference available. false 128 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 15000000 15 false false 2 false true -1000000 -1 false false No definition available. No authoritative reference available. false 130 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 131000000 131 false false 2 false true 98000000 98 false false No definition available. No authoritative reference available. true 131 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 132 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 -125000000 -125 false false 2 false true -109000000 -109 false false No definition available. No authoritative reference available. false 133 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 1000000 1 false false 2 false true 50000000 50 false false No definition available. No authoritative reference available. false 134 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 -8000000 -8 false false No definition available. No authoritative reference available. false 136 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 -124000000 -124 false false 2 false true -67000000 -67 false false No definition available. No authoritative reference available. true 137 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 138 Dividends paid on common stock 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 139 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 32000000 32 false false 2 false true 62000000 62 false false No definition available. No authoritative reference available. false 142 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 143 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 -116000000 -116 false false No definition available. No authoritative reference available. false 144 Issuances 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 -141000000 -141 false false 2 false true -82000000 -82 false false No definition available. No authoritative reference available. false 146 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 -6000000 -6 false false No definition available. No authoritative reference available. false 147 Net Cash (Used By) From 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 -139000000 -139 false false 2 false true -34000000 -34 false false No definition available. No authoritative reference available. true 148 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 -132000000 -132 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. true 149 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 150 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 6000000 6 false false 2 false true 8000000 8 false false No definition available. No authoritative reference available. false 151 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 152 Asset retirement obligations associated with removal costs transferred to regulatory liabilities 2 pom_NoncashTransferOfAssetRetirementObligations pom false credit duration monetary The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. false false false false false false false false false 1 false true 5000000 5 false false 2 false true -1000000 -1 false false The non-cash transfer of asset retirement obligations associated with removal costs to regulatory liabilities. No authoritative reference available. false 154 Conversion of DPL long-term debt to short-term debt 2 pom_ConversionOfConvertibleNote pom false credit duration monetary The non-cash conversion of long term debt into short term debt. false false false false false false false false false 1 false true 0 0 false false 2 false true 150000000 150 false false The non-cash conversion of long term debt into short term debt. No authoritative reference available. false 155 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 156 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 18000000 18 false false 2 false true 8000000 8 false false No definition available. No authoritative reference available. false 157 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 158 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 159 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 33000000 33 false false 2 false true 52000000 52 false false No definition available. No authoritative reference available. false 160 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 161 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 78000000 78 false false 2 false true 80000000 80 false false No definition available. No authoritative reference available. false 167 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 46000000 46 false false 2 false true 19000000 19 false false No definition available. No authoritative reference available. false 169 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 170 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 -5000000 -5 false false 2 false true -23000000 -23 false false No definition available. No authoritative reference available. false 173 Regulatory assets and liabilities, net 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 -139000000 -139 false false 2 false true -2000000 -2 false false No definition available. No authoritative reference available. false 174 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 -9000000 -9 false false 2 false true 25000000 25 false false No definition available. No authoritative reference available. false 175 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 178 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 20000000 20 false false No definition available. No authoritative reference available. false 179 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 3000000 3 false false 2 false true -3000000 -3 false false No definition available. No authoritative reference available. false 180 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 5000000 5 false false No definition available. No authoritative reference available. false 181 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 -44000000 -44 false false 2 false true -48000000 -48 false false No definition available. No authoritative reference available. false 182 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 125000000 125 false false No definition available. No authoritative reference available. true 183 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 184 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 -98000000 -98 false false 2 false true -122000000 -122 false false No definition available. No authoritative reference available. false 185 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 188 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 -98000000 -98 false false 2 false true -121000000 -121 false false No definition available. No authoritative reference available. true 189 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 190 Dividends paid on common stock 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 191 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 129000000 129 false false 2 false true 35000000 35 false false No definition available. No authoritative reference available. false 195 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 -23000000 -23 false false 2 false true -126000000 -126 false false No definition available. No authoritative reference available. false 196 Issuances 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 40000000 40 false false 2 false true 167000000 167 false false No definition available. No authoritative reference available. false 198 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 -9000000 -9 false false No definition available. No authoritative reference available. false 199 Net Cash (Used By) From 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 120000000 120 false false 2 false true 36000000 36 false false No definition available. No authoritative reference available. true 200 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 40000000 40 false false No definition available. No authoritative reference available. true 201 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 202 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 47000000 47 false false No definition available. No authoritative reference available. false 207 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 208 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 11000000 11 false false No definition available. No authoritative reference available. false false 2 156 false Millions UnKnown UnKnown false true