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No authoritative reference available. false 2 Operating Revenue 2 us-gaap_RevenuesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Power Delivery 2 us-gaap_UtilityRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 true true false false 1600000000 1600 false false false 2 true true false false 1428000000 1428 false false false 3 true true false false 4011000000 4011 false false false 4 true true false false 3895000000 3895 false false false xbrli:monetaryItemType monetary The aggregate amount of revenues for public and other utilities generated by the sale of electricity, water, gas, and other services. No authoritative reference available. false 4 Pepco Energy Services 2 us-gaap_SalesRevenueFromEnergyCommoditiesAndServices us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 457000000 457 false false false 2 false true false false 611000000 611 false false false 3 false true false false 1480000000 1480 false false false 4 false true false false 1828000000 1828 false false false xbrli:monetaryItemType monetary Revenue derived from energy-related services such supplying various forms of energy (such as steam, electricity and chilled water from the operation of on-site facilities or cogeneration plants), procurement services provided to energy purchasers, and the marketing and trading of energy commodities and derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 5 Other 2 pom_RevenueOther pom false credit duration Reflects all other revenue, including revenue from cross-border energy lease investments, recognized by the entity in the... false false false false false false false false false false false false 1 false true false false 10000000 10 false false false 2 false true false false 11000000 11 false false false 3 false true false false 31000000 31 false false false 4 false true false false 30000000 30 false false false xbrli:monetaryItemType monetary Reflects all other revenue, including revenue from cross-border energy lease investments, recognized by the entity in the period, not otherwise specified in the income statement. No authoritative reference available. false 6 Total Operating Revenue 2 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 2067000000 2067 false false false 2 false true false false 2050000000 2050 false false false 3 false true false false 5522000000 5522 false false false 4 false true false false 5753000000 5753 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 10 Operating Expenses 2 us-gaap_OperatingExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 11 Fuel and purchased energy 2 pom_CostElectricFuelPurchasedPower pom false debit duration Costs of purchased power as well as fuel used to generate electricity. false false false false false false false false false false false false 1 false true false false 1319000000 1319 false false false 2 false true false false 1442000000 1442 false false false 3 false true false false 3696000000 3696 false false false 4 false true false false 4167000000 4167 false false false xbrli:monetaryItemType monetary Costs of purchased power as well as fuel used to generate electricity. No authoritative reference available. false 12 Other services cost of sales 2 us-gaap_OtherCostOfServices us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 38000000 38 false false false 2 false true false false 25000000 25 false false false 3 false true false false 85000000 85 false false false 4 false true false false 60000000 60 false false false xbrli:monetaryItemType monetary Other costs incurred and are directly related to services rendered by an entity during the reporting period. No authoritative reference available. false 15 Other operation and maintenance 2 pom_OtherOperationsAndMaintenanceExpenses pom false debit duration Other operating and maintenance expenses including selling, general and administrative expenses. false false false false false false false false false false false false 1 false true false false 228000000 228 false false false 2 false true false false 213000000 213 false false false 3 false true false false 636000000 636 false false false 4 false true false false 618000000 618 false false false xbrli:monetaryItemType monetary Other operating and maintenance expenses including selling, general and administrative expenses. No authoritative reference available. false 16 Restructuring charge 2 us-gaap_RestructuringCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 14000000 14 false false false 2 false false false false 0 0 false false false 3 false true false false 14000000 14 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 false 17 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 104000000 104 false false false 2 false true false false 93000000 93 false false false 3 false true false false 286000000 286 false false false 4 false true false false 265000000 265 false false false xbrli:monetaryItemType monetary Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 18 Other taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 130000000 130 false false false 2 false true false false 100000000 100 false false false 3 false true false false 327000000 327 false false false 4 false true false false 279000000 279 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 19 Deferred electric service costs 2 pom_RegulatoryOperatingExpense pom false debit duration Net (increase) decrease in expenses resulting from the change in the regulatory assets balance that arose from the deferral... false false false false false false false false false false false false 1 false true false false 13000000 13 false false false 2 false true false false -32000000 -32 false false false 3 false true false false -69000000 -69 false false false 4 false true false false -116000000 -116 false false false xbrli:monetaryItemType monetary Net (increase) decrease in expenses resulting from the change in the regulatory assets balance that arose from the deferral of certain costs expected to be recovered in future rates. No authoritative reference available. false 20 Effects of divestiture-related claims 2 us-gaap_GainLossRelatedToLitigationSettlement us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 9000000 9 false false false 2 false true false false -26000000 -26 false false false 3 false true false false 11000000 11 false false false 4 false true false false -40000000 -40 false false false xbrli:monetaryItemType monetary The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) litigation reserves extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 false 21 Total Operating Expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1855000000 1855 false false false 2 false true false false 1815000000 1815 false false false 3 false true false false 4986000000 4986 false false false 4 false true false false 5233000000 5233 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 22 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 212000000 212 false false false 2 false true false false 235000000 235 false false false 3 false true false false 536000000 536 false false false 4 false true false false 520000000 520 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 23 Other Income (Expenses) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 24 Interest and dividend income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 false 25 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -68000000 -68 false false false 2 false true false false -85000000 -85 false false false 3 false true false false -240000000 -240 false false false 4 false true false false -254000000 -254 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 26 Gain (loss) from equity investments 2 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 1000000 1 false false false 3 false true false false -1000000 -1 false false false 4 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 27 Loss on extinguishment of debt 2 us-gaap_GainsLossesOnExtinguishmentOfDebt us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -135000000 -135 false false false 2 false false false false 0 0 false false false 3 false true false false -135000000 -135 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 false 28 Other income 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 6000000 6 false false false 2 false true false false 4000000 4 false false false 3 false true false false 17000000 17 false false false 4 false true false false 12000000 12 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 29 Other expenses 2 us-gaap_OtherNonoperatingExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false -1000000 -1 false false false xbrli:monetaryItemType monetary Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 false 30 Total Other Expenses 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -197000000 -197 false false false 2 false true false false -80000000 -80 false false false 3 false true false false -359000000 -359 false false false 4 false true false false -239000000 -239 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 true 31 Income from Continuing Operations Before Income Tax Expense 2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 15000000 15 false false false 2 false true false false 155000000 155 false false false 3 false true false false 177000000 177 false false false 4 false true false false 281000000 281 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 32 Income Tax Expense (Benefit) 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false -6000000 -6 false false false 2 false true false false 51000000 51 false false false 3 false true false false 52000000 52 false false false 4 false true false false 97000000 97 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 33 Net Income from Continuing Operations 2 us-gaap_IncomeLossFromContinuingOperations us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 21000000 21 false false false 2 false true false false 104000000 104 false false false 3 false true false false 125000000 125 false false false 4 false true false false 184000000 184 false false false xbrli:monetaryItemType monetary This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(1) true 34 (Loss) Income from Discontinued Operations, net of Income Taxes 2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -4000000 -4 false false false 2 false true false false 20000000 20 false false false 3 false true false false -126000000 -126 false false false 4 false true false false 10000000 10 false false false xbrli:monetaryItemType monetary This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c false 35 Net Income (Loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 17000000 17 false false false 2 false true false false 124000000 124 false false false 3 false true false false -1000000 -1 false false false 4 false true false false 194000000 194 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 36 Retained Earnings at Beginning of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 1130000000 1130 false false false 2 false true false false 1222000000 1222 false false false 3 false true false false 1268000000 1268 false false false 4 false true false false 1271000000 1271 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 37 Dividends Paid 2 us-gaap_DividendsCash us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -61000000 -61 false false false 2 false true false false -59000000 -59 false false false 3 false true false false -181000000 -181 false false false 4 false true false false -178000000 -178 false false false xbrli:monetaryItemType monetary Cash dividends declared by an entity during the period for all classes of stock (common, preferred). This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l false 38 Retained Earnings at End of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 1086000000 1086 false false false 2 false true false false 1287000000 1287 false false false 3 false true false false 1086000000 1086 false false false 4 false true false false 1287000000 1287 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 39 Basic and Diluted Share Information 2 pom_EarningsPerShareBasicAndDilutedAbstract pom false na duration Earnings Per Share, Basic and Diluted [Abstract] false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Earnings Per Share, Basic and Diluted [Abstract] false 40 Weighted average shares outstanding (millions) 2 pom_WeightedAverageNumberBasicDilutedSharesOutstanding pom false na duration Weighted Average Number of Shares Outstanding where Basic and Diluted are the same and reported as a single line false false false false false false false false false false false false 1 false true false false 224000000 224 false false false 2 false true false false 221000000 221 false false false 3 false true false false 223000000 223 false false false 4 false true false false 220000000 220 false false false xbrli:sharesItemType shares Weighted Average Number of Shares Outstanding where Basic and Diluted are the same and reported as a single line No authoritative reference available. false 41 Earnings per share of common stock from Continuing Operations 2 pom_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare pom false na duration The amount of income (loss) from continuing operations per each share of common stock outstanding and diluted during the... false false false false false false false false false false false true 1 true true false false 0.09 0.09 false false false 2 true true false false 0.47 0.47 false false false 3 true true false false 0.56 0.56 false false false 4 true true false false 0.84 0.84 false false false us-types:perShareItemType decimal The amount of income (loss) from continuing operations per each share of common stock outstanding and diluted during the reporting period. No authoritative reference available. false 42 (Loss) Earnings per share of common stock from Discontinued Operations 2 pom_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare pom false na duration The amount of income (loss) from discontinued operations, net of related tax effect, per each share of common stock... false false false false false false false false false false false true 1 true true false false -0.01 -0.01 false false false 2 true true false false 0.09 0.09 false false false 3 true true false false -0.56 -0.56 false false false 4 true true false false 0.04 0.04 false false false us-types:perShareItemType decimal The amount of income (loss) from discontinued operations, net of related tax effect, per each share of common stock outstanding and diluted during the reporting period. No authoritative reference available. false 43 Basic and diluted earnings (loss) per share 2 pom_EarningsPerShareBasicAndDiluted pom false na duration Earnings (net income) per Basic and Diluted Share. false false false false false false false false false false false totallabel true 1 true true false false 0.08 0.08 false false false 2 true true false false 0.56 0.56 false false false 3 false false false false 0 0 false false false 4 true true false false 0.88 0.88 false false false us-types:perShareItemType decimal Earnings (net income) per Basic and Diluted Share. No authoritative reference available. true 44 ATLANTIC CITY ELECTRIC CO 0 na true na na No definition available. false true false false false false false false false false false http://www.pepcoholdings.com/taxonomy/role/statementofincomealternative false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 5 USD true false false false ATLANTIC CITY ELECTRIC CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_AtlanticCityElectricCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 6 USD true false false false ATLANTIC CITY ELECTRIC CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_AtlanticCityElectricCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false ATLANTIC CITY ELECTRIC CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_AtlanticCityElectricCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 8 USD true false false false ATLANTIC CITY ELECTRIC CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_AtlanticCityElectricCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 45 Operating Revenue 2 us-gaap_RevenuesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 52 Total Operating Revenue 2 us-gaap_RegulatedOperatingRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 518000000 518 false false false 2 false true false false 441000000 441 false false false 3 false true false false 1150000000 1150 false false false 4 false true false false 1072000000 1072 false false false xbrli:monetaryItemType monetary The total amount of regulated operating revenues recognized during the period. No authoritative reference available. true 53 Operating Expenses 2 us-gaap_OperatingExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 56 Purchased energy 2 us-gaap_CostOfPurchasedPower us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 341000000 341 false false false 2 false true false false 334000000 334 false false false 3 false true false false 819000000 819 false false false 4 false true false false 850000000 850 false false false xbrli:monetaryItemType monetary Cost of electricity purchased and sold during the reporting period. No authoritative reference available. false 58 Other operation and maintenance 2 pom_OtherOperationsAndMaintenanceExpenses pom false debit duration Other operating and maintenance expenses including selling, general and administrative expenses. false false false false false false false false false false false false 1 false true false false 54000000 54 false false false 2 false true false false 50000000 50 false false false 3 false true false false 151000000 151 false false false 4 false true false false 145000000 145 false false false xbrli:monetaryItemType monetary Other operating and maintenance expenses including selling, general and administrative expenses. No authoritative reference available. false 59 Restructuring charge 2 us-gaap_RestructuringCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3000000 3 false false false 2 false false false false 0 0 false false false 3 false true false false 3000000 3 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 false 60 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 32000000 32 false false false 2 false true false false 29000000 29 false false false 3 false true false false 81000000 81 false false false 4 false true false false 78000000 78 false false false xbrli:monetaryItemType monetary Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 61 Other taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 8000000 8 false false false 2 false true false false 6000000 6 false false false 3 false true false false 20000000 20 false false false 4 false true false false 16000000 16 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 62 Deferred electric service costs 2 pom_RegulatoryOperatingExpense pom false debit duration Net (increase) decrease in expenses resulting from the change in the regulatory assets balance that arose from the deferral... false false false false false false false false false false false false 1 false true false false 13000000 13 false false false 2 false true false false -32000000 -32 false false false 3 false true false false -69000000 -69 false false false 4 false true false false -116000000 -116 false false false xbrli:monetaryItemType monetary Net (increase) decrease in expenses resulting from the change in the regulatory assets balance that arose from the deferral of certain costs expected to be recovered in future rates. No authoritative reference available. false 64 Total Operating Expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 451000000 451 false false false 2 false true false false 387000000 387 false false false 3 false true false false 1005000000 1005 false false false 4 false true false false 973000000 973 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 65 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 67000000 67 false false false 2 false true false false 54000000 54 false false false 3 false true false false 145000000 145 false false false 4 false true false false 99000000 99 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 66 Other Income (Expenses) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 68 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -17000000 -17 false false false 2 false true false false -16000000 -16 false false false 3 false true false false -49000000 -49 false false false 4 false true false false -50000000 -50 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 71 Other income 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 1000000 1 false false false 4 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 73 Total Other Expenses 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -17000000 -17 false false false 2 false true false false -16000000 -16 false false false 3 false true false false -48000000 -48 false false false 4 false true false false -49000000 -49 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 true 74 Income from Continuing Operations Before Income Tax Expense 2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 50000000 50 false false false 2 false true false false 38000000 38 false false false 3 false true false false 97000000 97 false false false 4 false true false false 50000000 50 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 75 Income Tax Expense (Benefit) 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 20000000 20 false false false 2 false true false false 15000000 15 false false false 3 false true false false 43000000 43 false false false 4 false true false false 17000000 17 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 78 Net Income (Loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 30000000 30 false false false 2 false true false false 23000000 23 false false false 3 false true false false 54000000 54 false false false 4 false true false false 33000000 33 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 79 Retained Earnings at Beginning of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 167000000 167 false false false 2 false true false false 152000000 152 false false false 3 false true false false 143000000 143 false false false 4 false true false false 166000000 166 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 80 Dividends Paid 2 us-gaap_DividendsCash us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false -24000000 -24 false false false xbrli:monetaryItemType monetary Cash dividends declared by an entity during the period for all classes of stock (common, preferred). This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l false 81 Retained Earnings at End of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 197000000 197 false false false 2 false true false false 175000000 175 false false false 3 false true false false 197000000 197 false false false 4 false true false false 175000000 175 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 87 DELMARVA POWER & LIGHT CO /DE/ 0 na true na na No definition available. false true false false false false false false false false false http://www.pepcoholdings.com/taxonomy/role/statementofincomealternative false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 9 USD true false false false DELMARVA POWER & LIGHT CO /DE/ dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_DelmarvaPowerLightCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 10 USD true false false false DELMARVA POWER & LIGHT CO /DE/ dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_DelmarvaPowerLightCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false DELMARVA POWER & LIGHT CO /DE/ dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_DelmarvaPowerLightCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 12 USD true false false false DELMARVA POWER & LIGHT CO /DE/ dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_DelmarvaPowerLightCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 88 Operating Revenue 2 us-gaap_RevenuesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 93 Electric 2 us-gaap_ElectricUtilityRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 342000000 342 false false false 2 false true false false 311000000 311 false false false 3 false true false false 901000000 901 false false false 4 false true false false 883000000 883 false false false xbrli:monetaryItemType monetary The aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 94 Natural Gas 2 us-gaap_RevenueFromPurchasedOilAndGas us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 35000000 35 false false false 2 false true false false 28000000 28 false false false 3 false true false false 166000000 166 false false false 4 false true false false 199000000 199 false false false xbrli:monetaryItemType monetary Revenue from sale of oil and gas purchased from other sources. No authoritative reference available. false 95 Total Operating Revenue 2 us-gaap_RegulatedOperatingRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 377000000 377 false false false 2 false true false false 339000000 339 false false false 3 false true false false 1067000000 1067 false false false 4 false true false false 1082000000 1082 false false false xbrli:monetaryItemType monetary The total amount of regulated operating revenues recognized during the period. No authoritative reference available. true 96 Operating Expenses 2 us-gaap_OperatingExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 99 Purchased energy 2 us-gaap_CostOfPurchasedPower us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 225000000 225 false false false 2 false true false false 211000000 211 false false false 3 false true false false 585000000 585 false false false 4 false true false false 591000000 591 false false false xbrli:monetaryItemType monetary Cost of electricity purchased and sold during the reporting period. No authoritative reference available. false 100 Gas purchased 2 us-gaap_CostOfPurchasedOilAndGas us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 26000000 26 false false false 2 false true false false 19000000 19 false false false 3 false true false false 117000000 117 false false false 4 false true false false 147000000 147 false false false xbrli:monetaryItemType monetary Cost of oil and gas purchased during the reporting period. No authoritative reference available. false 101 Other operation and maintenance 2 pom_OtherOperationsAndMaintenanceExpenses pom false debit duration Other operating and maintenance expenses including selling, general and administrative expenses. false false false false false false false false false false false false 1 false true false false 65000000 65 false false false 2 false true false false 64000000 64 false false false 3 false true false false 191000000 191 false false false 4 false true false false 182000000 182 false false false xbrli:monetaryItemType monetary Other operating and maintenance expenses including selling, general and administrative expenses. No authoritative reference available. false 102 Restructuring charge 2 us-gaap_RestructuringCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4000000 4 false false false 2 false false false false 0 0 false false false 3 false true false false 4000000 4 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 false 103 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 22000000 22 false false false 2 false true false false 19000000 19 false false false 3 false true false false 62000000 62 false false false 4 false true false false 56000000 56 false false false xbrli:monetaryItemType monetary Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 104 Other taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 10000000 10 false false false 2 false true false false 8000000 8 false false false 3 false true false false 28000000 28 false false false 4 false true false false 27000000 27 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 107 Total Operating Expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 352000000 352 false false false 2 false true false false 321000000 321 false false false 3 false true false false 987000000 987 false false false 4 false true false false 1003000000 1003 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 108 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 25000000 25 false false false 2 false true false false 18000000 18 false false false 3 false true false false 80000000 80 false false false 4 false true false false 79000000 79 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 109 Other Income (Expenses) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 111 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -10000000 -10 false false false 2 false true false false -11000000 -11 false false false 3 false true false false -32000000 -32 false false false 4 false true false false -33000000 -33 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 114 Other income 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false true false false 4000000 4 false false false 4 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 116 Total Other Expenses 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -9000000 -9 false false false 2 false true false false -11000000 -11 false false false 3 false true false false -28000000 -28 false false false 4 false true false false -32000000 -32 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 true 117 Income from Continuing Operations Before Income Tax Expense 2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 16000000 16 false false false 2 false true false false 7000000 7 false false false 3 false true false false 52000000 52 false false false 4 false true false false 47000000 47 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 118 Income Tax Expense (Benefit) 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 7000000 7 false false false 2 false true false false -7000000 -7 false false false 3 false true false false 23000000 23 false false false 4 false true false false 7000000 7 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 121 Net Income (Loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 9000000 9 false false false 2 false true false false 14000000 14 false false false 3 false true false false 29000000 29 false false false 4 false true false false 40000000 40 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 122 Retained Earnings at Beginning of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 469000000 469 false false false 2 false true false false 446000000 446 false false false 3 false true false false 472000000 472 false false false 4 false true false false 448000000 448 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 123 Dividends Paid 2 us-gaap_DividendsCash us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -23000000 -23 false false false 4 false true false false -28000000 -28 false false false xbrli:monetaryItemType monetary Cash dividends declared by an entity during the period for all classes of stock (common, preferred). This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l false 124 Retained Earnings at End of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 478000000 478 false false false 2 false true false false 460000000 460 false false false 3 false true false false 478000000 478 false false false 4 false true false false 460000000 460 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 130 POTOMAC ELECTRIC POWER CO 0 na true na na No definition available. false true false false false false false false false false false http://www.pepcoholdings.com/taxonomy/role/statementofincomealternative false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 13 USD true false false false POTOMAC ELECTRIC POWER CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_PotomacElectricPowerCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 14 USD true false false false POTOMAC ELECTRIC POWER CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_PotomacElectricPowerCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false POTOMAC ELECTRIC POWER CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_PotomacElectricPowerCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 $ false 16 USD true false false false POTOMAC ELECTRIC POWER CO dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi pom_PotomacElectricPowerCoMember dei_LegalEntityAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 131 Operating Revenue 2 us-gaap_RevenuesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 138 Total Operating Revenue 2 us-gaap_RegulatedOperatingRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 706000000 706 false false false 2 false true false false 648000000 648 false false false 3 false true false false 1797000000 1797 false false false 4 false true false false 1743000000 1743 false false false xbrli:monetaryItemType monetary The total amount of regulated operating revenues recognized during the period. No authoritative reference available. true 139 Operating Expenses 2 us-gaap_OperatingExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 142 Purchased energy 2 us-gaap_CostOfPurchasedPower us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 356000000 356 false false false 2 false true false false 350000000 350 false false false 3 false true false false 932000000 932 false false false 4 false true false false 972000000 972 false false false xbrli:monetaryItemType monetary Cost of electricity purchased and sold during the reporting period. No authoritative reference available. false 144 Other operation and maintenance 2 pom_OtherOperationsAndMaintenanceExpenses pom false debit duration Other operating and maintenance expenses including selling, general and administrative expenses. false false false false false false false false false false false false 1 false true false false 93000000 93 false false false 2 false true false false 84000000 84 false false false 3 false true false false 252000000 252 false false false 4 false true false false 244000000 244 false false false xbrli:monetaryItemType monetary Other operating and maintenance expenses including selling, general and administrative expenses. No authoritative reference available. false 145 Restructuring charge 2 us-gaap_RestructuringCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6000000 6 false false false 2 false false false false 0 0 false false false 3 false true false false 6000000 6 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 false 146 Depreciation and amortization 2 us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 43000000 43 false false false 2 false true false false 36000000 36 false false false 3 false true false false 121000000 121 false false false 4 false true false false 108000000 108 false false false xbrli:monetaryItemType monetary Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 147 Other taxes 2 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 110000000 110 false false false 2 false true false false 83000000 83 false false false 3 false true false false 273000000 273 false false false 4 false true false false 230000000 230 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 149 Effects of divestiture-related claims 2 us-gaap_GainLossRelatedToLitigationSettlement us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 9000000 9 false false false 2 false true false false -26000000 -26 false false false 3 false true false false 11000000 11 false false false 4 false true false false -40000000 -40 false false false xbrli:monetaryItemType monetary The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) litigation reserves extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 false 150 Total Operating Expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 617000000 617 false false false 2 false true false false 527000000 527 false false false 3 false true false false 1595000000 1595 false false false 4 false true false false 1514000000 1514 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 151 Operating Income 2 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 89000000 89 false false false 2 false true false false 121000000 121 false false false 3 false true false false 202000000 202 false false false 4 false true false false 229000000 229 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 152 Other Income (Expenses) 2 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 153 Interest and dividend income 2 us-gaap_InvestmentIncomeInterestAndDividend us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 1000000 1 false false false 4 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 false 154 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -24000000 -24 false false false 2 false true false false -25000000 -25 false false false 3 false true false false -74000000 -74 false false false 4 false true false false -75000000 -75 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 157 Other income 2 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 5000000 5 false false false 2 false true false false 2000000 2 false false false 3 false true false false 10000000 10 false false false 4 false true false false 7000000 7 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 158 Other expenses 2 us-gaap_OtherNonoperatingExpense us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false -1000000 -1 false false false xbrli:monetaryItemType monetary Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 false 159 Total Other Expenses 2 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -19000000 -19 false false false 2 false true false false -23000000 -23 false false false 3 false true false false -63000000 -63 false false false 4 false true false false -68000000 -68 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 true 160 Income from Continuing Operations Before Income Tax Expense 2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 70000000 70 false false false 2 false true false false 98000000 98 false false false 3 false true false false 139000000 139 false false false 4 false true false false 161000000 161 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 161 Income Tax Expense (Benefit) 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 33000000 33 false false false 2 false true false false 40000000 40 false false false 3 false true false false 62000000 62 false false false 4 false true false false 67000000 67 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 164 Net Income (Loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 37000000 37 false false false 2 false true false false 58000000 58 false false false 3 false true false false 77000000 77 false false false 4 false true false false 94000000 94 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 165 Retained Earnings at Beginning of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 720000000 720 false false false 2 false true false false 660000000 660 false false false 3 false true false false 730000000 730 false false false 4 false true false false 624000000 624 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 166 Dividends Paid 2 us-gaap_DividendsCash us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -45000000 -45 false false false 2 false false false false 0 0 false false false 3 false true false false -95000000 -95 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash dividends declared by an entity during the period for all classes of stock (common, preferred). This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l false 167 Retained Earnings at End of Period 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 true true false false 712000000 712 false false false 2 true true false false 718000000 718 false false false 3 true true false false 712000000 712 false false false 4 true true false false 718000000 718 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 4 108 false Millions Millions NoRounding false true