1.0.0.3 true NEWLY ADOPTED ACCOUNTING STANDARDS false 1 $ true false false false PEPCO HOLDINGS INC dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 1 PEPCO HOLDINGS INC 0 na true na na na No definition available. false true false false false false false false false 1 false false 0 0 false false No definition available. No authoritative reference available. false 2 Notes to Financial Statements [Abstract] 2 pom false na duration string Notes to Financial Statements [Abstract] false false false false false true false false false 1 false false 0 0 false false Notes to Financial Statements [Abstract] false 3 NEWLY ADOPTED ACCOUNTING STANDARDS 2 us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (3) NEWLY ADOPTED ACCOUNTING STANDARDS Business Combinations (ASC 805) The accounting guidance on business combinations was amended by the FASB effective beginning January 1, 2009. The amendment did not change the fundamental concepts that the acquisition method of accounting be used and that an acquirer must be identified for each business combination. However, the guidance expanded the definition of a business subject to this guidance and also requires the acquirer to recognize changes in the amount of its deferred tax benefits that are realizable because of a business combination either in income from continuing operations or directly in contributed capital, depending on the circumstances. On April 1, 2009, the FASB issued additional guidance to clarify the accounting for the initial recognition and measurement, subsequent measurement and accounting, and disclosure of assets and liabilities arising from contingencies in a business combination. The additional guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be measured at fair value if the acquisition date fair value of that asset and liability can be determined during the measurement period. If the acquisition date fair value cannot be determined, then the asset or liability would be measured in accordance with FASB guidance on contingencies (ASC 450). The new guidance applies prospectively to business combinations for which the acquisition date is on or after January 1, 2009. The adoption of the guidance did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows. Fair Value Measurement and Disclosures (ASC 820) There is a variety of new accounting guidance from the FASB that is effective for different financial reporting periods during 2009. Nonrecurring fair value measurement guidance for non-financial assets and non-financial liabilities was effective beginning January 1, 2009 for PHI. The adoption of this guidance did not have a material impact on the fair value measurements of PHI’s non-financial assets and non-financial liabilities. New FASB guidance for the fair value measurement of liabilities issued with inseparable third-party credit enhancements was also effective beginning January 1, 2009 for PHI. The guidance applies to liabilities such as debt, derivatives, and other instruments that are guaranteed by third parties. The effect of the credit enhancement may not be included in the fair value measurement of the liability, even if the liability has an inseparable third-party credit enhancement. The issuer is required to disclose the existence of the inseparable third-party credit enhancement on the issued liability. The adoption of the guidance did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows. PHI adopted new FASB guidance in the second quarter of 2009 for fair value measurement when markets are inactive and distressed. This guidance was effective for interim periods ending after June 15, 2009. The guidance outlines a two-step test to identify inactive and distressed markets and provides a fair value application example for financial instruments when both conditions are met. The guidance primarily applies to PHI’s valuation of its derivatives in the event they were being valued using information from inactive and distressed markets. These market conditions would require management to exercise judgment regarding how the market information is incorporated into the measurement of fair value. This guidance did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows. Effective beginning with its June 30, 2009 financial statements, PHI began disclosing the fair value of debt issued by PHI and its utilities on a quarterly basis in Note (13), “Fair Value Disclosures,” in accordance with FASB guidance which is effective for interim reporting periods ending after June 15, 2009. Disclosures for the prior year-end balance sheet were also required.   Consolidation (ASC 810) The FASB established new accounting and reporting standards for a non-controlling interest (also called a “minority interest”) in a subsidiary and for the deconsolidation of a subsidiary. The new guidance clarified that a non-controlling interest in a subsidiary is an ownership interest in the consolidated entity that should be separately reported in the consolidated financial statements. The guidance was effective prospectively for financial statement reporting periods beginning January 1, 2009 for PHI, except for the financial statement presentation and disclosure requirements which also apply to prior reporting periods presented. As of January 1, 2009, PHI adopted the provisions of this guidance and reclassified $6 million of non-controlling interests from the minority interest line item of its balance sheet to a component of equity. Otherwise, the adoption of the guidance did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows. Derivatives and Hedging Disclosures (ASC 815) The FASB issued new disclosure requirements for derivatives and hedging effective for financial statement reporting periods beginning January 1, 2009 for PHI. Some of the new disclosures include derivative objectives and strategies, derivative volumes by product type, classification and gross fair values of derivative assets and liabilities, classification and amounts of gains and losses on derivatives and related hedged items, and credit-risk-related contingent features in derivatives. PHI adopted the new requirements beginning with its March 31, 2009 financial statements with comparative disclosures for prior reporting periods. The disclosures are included within Note (12), “Derivative Instruments and Hedging Activities.” Earnings Per Share (ASC 260) The FASB issued new guidance to determine when unvested instruments granted in share-based payment transactions are participating securities prior to vesting and, therefore, need to be included in the earnings allocation in computing earnings per share (EPS). As of January 1, 2009, PHI adopted the provisions of this guidance for the presentation of EPS data in the consolidated statements of income and Note (11), “Earnings Per Share.” All prior period EPS information presented was adjusted retrospectively to conform to the provisions of the guidance. The adoption did not result in a change in the reported EPS for prior periods presented. Investments – Equity Method and Joint Ventures (ASC 323) The FASB issued guidance addressing the accounting for equity method investments including: (i) how an equity method investment should initially be measured, (ii) how it should be tested for impairment, and (iii) how to account for an equity method investee’s issuance of shares. As of January 1, 2009, PHI adopted the provisions of this guidance and there was no material impact on PHI’s overall financial condition, results of operations, or cash flows. Investments – Debt and Equity Securities (ASC 320) The FASB issued new guidance on other-than-temporary impairment (OTTI) of debt and equity securities. The guidance requires information about the credit and noncredit component of an OTTI event and when an OTTI event has occurred. It requires separate display of losses related to credit deterioration and losses related to other market factors on the statements of income. Market-related losses would be recorded in other comprehensive income if it is not likely that the investor will have to sell the security prior to recovery. PHI adopted this guidance as of April 1, 2009, and concluded that none of its debt and equity securities investments were within its scope. The new guidance, therefore, did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows.   Subsequent Events (ASC 855) Beginning with its June 30, 2009 financial statements, PHI adopted new FASB guidelines for the disclosure of events that occur after the balance sheet reporting date but before the financial statements are issued. The new guidance requires the disclosure of the date through which PHI has assessed the impact of subsequent events on the financial statements. The new guidance was effective for interim or annual financial periods ending after June 15, 2009. PHI has disclosed this subsequent events date in Note (2), “Significant Accounting Policies.” FASB Accounting Standards Codification (ASC 105) The ASC identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of non-governmental financial statements presented under GAAP. In addition, it replaces the current reference system for standards and guidance with a new numerical designation system known as the ASC. The ASC will be the single source reference system for all authoritative GAAP. The ASC is numerically organized by topic, subtopic, section, and subsection. The ASC is effective for financial statements issued for interim and annual periods ending after September 15, 2009. PHI has adopted the ASC guidance and referencing system for GAAP in its September 30, 2009 financial statements. Entities are not required to revise previous financial statements for the change in references to GAAP. The adoption of ASC did not result in a change in accounting principle for PHI, therefore, it did not have a material impact on PHI’s overall financial condition, results of operations, or cash flows. </div> false false No definition available. No authoritative reference available. false 4 POTOMAC ELECTRIC POWER CO 0 na true na na na No definition available. false true false false false false false false false 1 false false 0 0 false false No definition available. No authoritative reference available. false 5 Notes to Financial Statements [Abstract] 2 pom false na duration string Notes to Financial Statements [Abstract] false false false false false true false false false 1 false false 0 0 false false Notes to Financial Statements [Abstract] false 6 NEWLY ADOPTED ACCOUNTING STANDARDS 2 us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (3) NEWLY ADOPTED ACCOUNTING STANDARDS Business Combinations (ASC 805) The accounting guidance on business combinations was amended by the FASB effective beginning January 1, 2009. The amendment did not change the fundamental concepts that the acquisition method of accounting be used and that an acquirer must be identified for each business combination. However, the guidance expanded the definition of a business subject to this guidance and also requires the acquirer to recognize changes in the amount of its deferred tax benefits that are realizable because of a business combination either in income from continuing operations or directly in contributed capital, depending on the circumstances. On April 1, 2009, the FASB issued additional guidance to clarify the accounting for the initial recognition and measurement, subsequent measurement and accounting, and disclosure of assets and liabilities arising from contingencies in a business combination. The additional guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be measured at fair value if the acquisition date fair value of that asset and liability can be determined during the measurement period. If the acquisition date fair value cannot be determined, then the asset or liability would be measured in accordance with FASB guidance on contingencies (ASC 450). The new guidance applies prospectively to business combinations for which the acquisition date is on or after January 1, 2009. The adoption of the guidance did not have a material impact on Pepco’s overall financial condition, results of operations, or cash flows. Fair Value Measurement and Disclosures (ASC 820) There is a variety of new accounting guidance from the FASB that is effective for different financial reporting periods during 2009. Nonrecurring fair value measurement guidance for non-financial assets and non-financial liabilities was effective beginning January 1, 2009 for Pepco. The adoption of this guidance did not have a material impact on the fair value measurements of Pepco’s non-financial assets and non-financial liabilities. Effective beginning with the June 30, 2009 financial statements, Pepco began disclosing the fair values of its financial instruments each quarter in accordance with FASB guidance. This new guidance is effective for interim reporting periods ending after June 15, 2009 and disclosures for the prior year-end balance sheet are required. The primary impact of the new guidance is disclosing the fair value of debt issued by Pepco on a quarterly basis in Note (9), “Fair Value Disclosures.” Consolidation (ASC 810) The FASB established new accounting and reporting standards for a non-controlling interest (also called a “minority interest”) in a subsidiary and for the deconsolidation of a subsidiary. The new guidance clarified that a non-controlling interest in a subsidiary is an ownership interest in the consolidated entity that should be separately reported in the consolidated financial statements. The guidance was effective prospectively for financial statement reporting periods beginning January 1, 2009 for Pepco, except for the financial statement presentation and disclosure requirements which also apply to prior reporting periods presented. As of January 1, 2009, Pepco adopted the provisions of this guidance and the provisions did not have a material impact on Pepco’s overall financial condition, results of operations, or cash flows.   Subsequent Events (ASC 855) Beginning with its June 30, 2009 financial statements, Pepco adopted new FASB guidelines for the disclosure of events that occur after the balance sheet reporting date but before the financial statements are issued. The new guidance requires the disclosure of the date through which Pepco has assessed the impact of subsequent events on the financial statements. The new guidance was effective for interim or annual financial periods ending after June 15, 2009. Pepco has disclosed this subsequent events date in Note (2), “Significant Accounting Policies.” FASB Accounting Standards Codification (ASC 105) The ASC identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of non-governmental financial statements presented under GAAP. In addition, it replaces the current reference system for standards and guidance with a new numerical designation system known as the ASC. The ASC will be the single source reference system for all authoritative GAAP. The ASC is numerically organized by topic, subtopic, section, and subsection. The ASC is effective for financial statements issued for interim and annual periods ending after September 15, 2009. Pepco has adopted the ASC guidance and referencing system for GAAP in its September 30, 2009 financial statements. Entities are not required to revise previous financial statements for the change in references to GAAP. The adoption of ASC did not result in a change in accounting principle for Pepco; therefore, it did not have a material impact on Pepco’s overall financial condition, results of operations, or cash flows. </div> false false No definition available. No authoritative reference available. false 7 DELMARVA POWER & LIGHT CO /DE/ 0 na true na na na No definition available. false true false false false false false false false 1 false false 0 0 false false No definition available. No authoritative reference available. false 8 Notes to Financial Statements [Abstract] 2 pom false na duration string Notes to Financial Statements [Abstract] false false false false false true false false false 1 false false 0 0 false false Notes to Financial Statements [Abstract] false 9 NEWLY ADOPTED ACCOUNTING STANDARDS 2 us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (3) NEWLY ADOPTED ACCOUNTING STANDARDS Business Combinations (ASC 805) The accounting guidance on business combinations was amended by the FASB effective beginning January 1, 2009. The amendment did not change the fundamental concepts that the acquisition method of accounting be used and that an acquirer must be identified for each business combination. However, the guidance expanded the definition of a business subject to this guidance and also requires the acquirer to recognize changes in the amount of its deferred tax benefits that are realizable because of a business combination either in income from continuing operations or directly in contributed capital, depending on the circumstances. On April 1, 2009, the FASB issued additional guidance to clarify the accounting for the initial recognition and measurement, subsequent measurement and accounting, and disclosure of assets and liabilities arising from contingencies in a business combination. The additional guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be measured at fair value if the acquisition date fair value of that asset and liability can be determined during the measurement period. If the acquisition date fair value cannot be determined, then the asset or liability would be measured in accordance with FASB guidance on contingencies (ASC 450). The new guidance applies prospectively to business combinations for which the acquisition date is on or after January 1, 2009. The adoption of the guidance did not have a material impact on DPL’s overall financial condition, results of operations, or cash flows. Fair Value Measurement and Disclosures (ASC 820) There is a variety of new accounting guidance from the FASB that is effective for different financial reporting periods during 2009. Nonrecurring fair value measurement guidance for non-financial assets and non-financial liabilities was effective beginning January 1, 2009 for DPL. The adoption of this guidance did not have a material impact on the fair value measurements of DPL’s non-financial assets and non-financial liabilities. New FASB guidance for the fair value measurement of liabilities issued with inseparable third-party credit enhancements was also effective beginning January 1, 2009 for DPL. The guidance applies to liabilities such as debt, derivatives, and other instruments that are guaranteed by third parties. The effect of the credit enhancement may not be included in the fair value measurement of the liability, even if the liability has an inseparable third-party credit enhancement. The issuer is required to disclose the existence of the inseparable third-party credit enhancement on the issued liability. The adoption of the guidance did not have a material impact on DPL’s overall financial condition, results of operations, or cash flows. DPL adopted new FASB guidance in the second quarter of 2009 for fair value measurement when markets are inactive and distressed. This guidance was effective for interim periods ending after June 15, 2009. The guidance outlines a two-step test to identify inactive and distressed markets and provides a fair value application example for financial instruments when both conditions are met. The guidance primarily applies to DPL’s valuation of its derivatives in the event they were being valued using information from inactive and distressed markets. These market conditions would require management to exercise judgment regarding how the market information is incorporated into the measurement of fair value. This guidance did not have a material impact on DPL’s overall financial condition, results of operations, or cash flows.   Effective beginning with its June 30, 2009 financial statements, DPL began disclosing the fair value of debt issued on a quarterly basis in Note (13), “Fair Value Disclosures,” in accordance with FASB guidance which is effective for interim reporting periods ending after June 15, 2009. Disclosures for the prior year-end balance sheet were also required. Consolidation (ASC 810) The FASB established new accounting and reporting standards for a non-controlling interest (also called a “minority interest”) in a subsidiary and for the deconsolidation of a subsidiary. The new guidance clarified that a non-controlling interest in a subsidiary is an ownership interest in the consolidated entity that should be separately reported in the consolidated financial statements. The guidance was effective prospectively for financial statement reporting periods beginning January 1, 2009 for DPL, except for the financial statement presentation and disclosure requirements which also apply to prior reporting periods presented. As of January 1, 2009, DPL adopted the provisions of this guidance and the guidance did not have a material impact on DPL’s overall financial condition, results of operations, or cash flows. Derivatives and Hedging Disclosures (ASC 815) The FASB issued new disclosure requirements for derivatives and hedging effective for financial statement reporting periods beginning January 1, 2009 for DPL. Some of the new disclosures include derivative objectives and strategies, derivative volumes by product type, classification and gross fair values of derivative assets and liabilities, classification and amounts of gains and losses on derivatives and related hedged items, and credit-risk-related contingent features in derivatives. DPL adopted the new requirements beginning with its March 31, 2009 financial statements with comparative disclosures for prior reporting periods. The disclosures are included within Note (10), “Derivative Instruments and Hedging Activities.” Subsequent Events (ASC 855) Beginning with its June 30, 2009 financial statements, DPL adopted new FASB guidelines for the disclosure of events that occur after the balance sheet reporting date but before the financial statements are issued. The new guidance requires the disclosure of the date through which DPL has assessed the impact of subsequent events on the financial statements. The new guidance was effective for interim or annual financial periods ending after June 15, 2009. DPL has disclosed this subsequent events date in Note (2), “Significant Accounting Policies.” FASB Accounting Standards Codification (ASC 105) The ASC identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of non-governmental financial statements presented under GAAP. In addition, it replaces the current reference system for standards and guidance with a new numerical designation system known as the ASC. The ASC will be the single source reference system for all authoritative GAAP. The ASC is numerically organized by topic, subtopic, section, and subsection. The ASC is effective for financial statements issued for interim and annual periods ending after September 15, 2009. DPL has adopted the ASC guidance and referencing system for GAAP in its September 30, 2009 financial statements. Entities are not required to revise previous financial statements for the change in references to GAAP. The adoption of ASC did not result in a change in accounting principle for DPL, therefore, it did not have a material impact on DPL’s overall financial condition, results of operations, or cash flows. </div> false false No definition available. No authoritative reference available. false 10 ATLANTIC CITY ELECTRIC CO 0 na true na na na No definition available. false true false false false false false false false 1 false false 0 0 false false No definition available. No authoritative reference available. false 11 Notes to Financial Statements [Abstract] 2 pom false na duration string Notes to Financial Statements [Abstract] false false false false false true false false false 1 false false 0 0 false false Notes to Financial Statements [Abstract] false 12 NEWLY ADOPTED ACCOUNTING STANDARDS 2 us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (3) NEWLY ADOPTED ACCOUNTING STANDARDS Business Combinations (ASC 805) The accounting guidance on business combinations was amended by the FASB effective beginning January 1, 2009. The amendment did not change the fundamental concepts that the acquisition method of accounting be used and that an acquirer must be identified for each business combination. However, the guidance expanded the definition of a business subject to this guidance and also requires the acquirer to recognize changes in the amount of its deferred tax benefits that are realizable because of a business combination either in income from continuing operations or directly in contributed capital, depending on the circumstances. On April 1, 2009, the FASB issued additional guidance to clarify the accounting for the initial recognition and measurement, subsequent measurement and accounting, and disclosure of assets and liabilities arising from contingencies in a business combination. The additional guidance requires that assets acquired and liabilities assumed in a business combination that arise from contingencies be measured at fair value if the acquisition date fair value of that asset and liability can be determined during the measurement period. If the acquisition date fair value cannot be determined, then the asset or liability would be measured in accordance with FASB guidance on contingencies (ASC 450). The new guidance applies prospectively to business combinations for which the acquisition date is on or after January 1, 2009. The adoption of the guidance did not have a material impact on ACE’s overall financial condition, results of operations, or cash flows. Fair Value Measurement and Disclosures (ASC 820) There is a variety of new accounting guidance from the FASB that is effective for different financial reporting periods during 2009. Nonrecurring fair value measurement guidance for non-financial assets and non-financial liabilities was effective beginning January 1, 2009 for ACE. The adoption of this guidance did not have a material impact on the fair value measurements of ACE’s non-financial assets and non-financial liabilities. Effective beginning with its June 30, 2009 financial statements, ACE began disclosing the fair value of debt issued on a quarterly basis in Note (13), “Fair Value Disclosures,” in accordance with FASB guidance which is effective for interim reporting periods ending after June 15, 2009. Disclosures for the prior year-end balance sheet were also required. Consolidation (ASC 810) The FASB established new accounting and reporting standards for a non-controlling interest (also called a “minority interest”) in a subsidiary and for the deconsolidation of a subsidiary. The new guidance clarified that a non-controlling interest in a subsidiary is an ownership interest in the consolidated entity that should be separately reported in the consolidated financial statements.   The guidance was effective prospectively for financial statement reporting periods beginning January 1, 2009 for ACE, except for the financial statement presentation and disclosure requirements which also apply to prior reporting periods presented. As of January 1, 2009, ACE adopted the provisions of this guidance and the provisions did not have a material impact on ACE’s overall financial condition, results of operations, or cash flows. Subsequent Events (ASC 855) Beginning with its June 30 2009 financial statements, ACE adopted new FASB guidelines for the disclosure of events that occur after the balance sheet reporting date but before the financial statements are issued. The new guidance requires the disclosure of the date through which ACE has assessed the impact of subsequent events on the financial statements. The new guidance was effective for interim or annual financial periods ending after June 15, 2009. ACE has disclosed this subsequent events date in Note (2), “Significant Accounting Policies.” FASB Accounting Standards Codification (ASC 105) The ASC identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of non-governmental financial statements presented under GAAP. In addition, it replaces the current reference system for standards and guidance with a new numerical designation system known as the ASC. The ASC will be the single source reference system for all authoritative GAAP. The ASC is numerically organized by topic, subtopic, section, and subsection. The ASC is effective for financial statements issued for interim and annual periods ending after September 15, 2009. ACE has adopted the ASC guidance and referencing system for GAAP in its September 30, 2009 financial statements. Entities are not required to revise previous financial statements for the change in references to GAAP. The adoption of ASC did not result in a change in accounting principle for ACE, therefore, it did not have a material impact on ACE’s overall financial condition, results of operations, or cash flows. </div> false false No definition available. No authoritative reference available. false false 1 12 false UnKnown UnKnown UnKnown false true