1.0.0.3 true ORGANIZATION 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 ORGANIZATION 2 us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (1) ORGANIZATION Pepco Holdings, Inc. (PHI or Pepco Holdings), a Delaware corporation incorporated in 2001, is a diversified energy company that, through its operating subsidiaries, is engaged primarily in two businesses:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr> <td valign="top" width="3%" align="left">•</td> <td valign="top" width="1%"> </td> <td valign="top" align="left"> the distribution, transmission and default supply of electricity and the delivery and supply of natural gas (Power Delivery), conducted through the following regulated public utility companies, each of which is a reporting company under the Securities Exchange Act of 1934, as amended: </td> </tr> </table>   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr> <td width="4%"> </td> <td valign="top" width="3%" align="left">•</td> <td valign="top" width="1%"> </td> <td valign="top" align="left"> Potomac Electric Power Company (Pepco), which was incorporated in Washington, D.C. in 1896 and became a domestic Virginia corporation in 1949, </td> </tr> </table>   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr> <td width="4%"> </td> <td valign="top" width="3%" align="left">•</td> <td valign="top" width="1%"> </td> <td valign="top" align="left"> Delmarva Power & Light Company (DPL), which was incorporated in Delaware in 1909 and became a domestic Virginia corporation in 1979, and </td> </tr> </table>   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr> <td width="4%"> </td> <td valign="top" width="3%" align="left">•</td> <td valign="top" width="1%"> </td> <td valign="top" align="left"> Atlantic City Electric Company (ACE), which was incorporated in New Jersey in 1924. </td> </tr> </table>   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr> <td valign="top" width="3%" align="left">•</td> <td valign="top" width="1%"> </td> <td valign="top" align="left"> competitive energy generation, marketing and supply (Competitive Energy) conducted through subsidiaries of Conectiv Energy Holding Company (collectively Conectiv Energy) and Pepco Energy Services, Inc. and its subsidiaries (collectively, Pepco Energy Services). </td> </tr> </table> PHI Service Company, a subsidiary service company of PHI, provides a variety of support services, including legal, accounting, treasury, tax, purchasing and information technology services to PHI and its operating subsidiaries. These services are provided pursuant to a service agreement among PHI, PHI Service Company, and the participating operating subsidiaries. The expenses of the PHI Service Company are charged to PHI and the participating operating subsidiaries in accordance with cost allocation methodologies set forth in the service agreement. The following is a description of each of PHI’s two principal business operations: Power Delivery The largest component of PHI’s business is Power Delivery. Each of Pepco, DPL and ACE is a regulated public utility in the jurisdictions that comprise its service territory. Each company owns and operates a network of wires, substations and other equipment that is classified either as transmission or distribution facilities. Transmission facilities are high-voltage systems that carry wholesale electricity into, or across, the utility’s service territory. Distribution facilities are low-voltage systems that carry electricity to end-use customers in the utility’s service territory. Together the three companies constitute a single segment for financial reporting purposes. Each company is responsible for the delivery of electricity and, in the case of DPL, natural gas, in its service territory, for which it is paid tariff rates established by the applicable local public service commissions. Each company also supplies electricity at regulated rates to retail customers in its service territory who do not elect to purchase electricity from a competitive energy supplier. The regulatory term for this supply service is Standard Offer Service in Delaware, the District of Columbia and Maryland; and Basic Generation Service (BGS) in New Jersey. In this Form 10-Q, these supply services are referred to generally as Default Electricity Supply.   Competitive Energy The Competitive Energy business provides competitive generation, marketing and supply of electricity and gas, and related energy management services, primarily in the mid-Atlantic region. PHI’s Competitive Energy operations are conducted through Conectiv Energy and Pepco Energy Services, each of which is treated as a separate operating segment for financial reporting purposes. PHI is continuing to evaluate the retail energy supply business of Pepco Energy Services relative to PHI’s strategic objectives with a view toward a possible restructuring, sale or wind down of the business. Among the factors being considered in this analysis is the return PHI earns by investing capital in the retail energy supply business as compared to alternative investments. PHI expects the retail energy supply business to remain profitable based on its existing contract backlog and because the variability of margins has been reduced by entering into corresponding wholesale energy purchase contracts. With the increased cost of capital associated with its collateral obligations factored into its retail pricing, Pepco Energy Services is experiencing reduced retail customer retention levels and reduced levels of new retail customer acquisitions. In March 2009, Pepco Energy Services entered into a credit intermediation arrangement with an investment banking firm, which is more fully described in Note (9), “Debt,” under the heading “Collateral Requirements of the Competitive Energy Business.” The arrangement eliminates the collateral requirements with respect to a portion of Pepco Energy Services’ wholesale electricity supply contracts. Other Business Operations Through its subsidiary Potomac Capital Investment Corporation (PCI), PHI maintains a portfolio of cross-border energy sale-leaseback transactions, with a book value at September 30, 2009 of approximately $1.4 billion. This activity constitutes a fourth operating segment for financial reporting purposes, which is designated as “Other Non-Regulated.” </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 ORGANIZATION 2 us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (1) ORGANIZATION Potomac Electric Power Company (Pepco) is engaged in the transmission and distribution of electricity in Washington, D.C. and major portions of Prince George’s County and Montgomery County in suburban Maryland. Pepco provides Default Electricity Supply, which is the supply of electricity at regulated rates to retail customers in its territories who do not elect to purchase electricity from a competitive supplier, in both the District of Columbia and Maryland. Default Electricity Supply is known as Standard Offer Service in both the District of Columbia and Maryland. Pepco is a wholly owned subsidiary of Pepco Holdings, Inc. (Pepco Holdings or PHI). </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 ORGANIZATION 2 us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (1) ORGANIZATION Delmarva Power & Light Company (DPL) is engaged in the transmission and distribution of electricity in Delaware and portions of Maryland and provides gas distribution service in northern Delaware. Additionally, DPL supplies electricity at regulated rates to retail customers in its territories who do not elect to purchase electricity from a competitive supplier. The regulatory term for this service is Standard Offer Service in both Delaware and Maryland. DPL is a wholly owned subsidiary of Conectiv, which is wholly owned by Pepco Holdings, Inc. (Pepco Holdings or PHI). In January 2008, DPL completed the sale of its Virginia retail electric distribution assets and the sale of its Virginia wholesale electric transmission assets, both located on Virginia’s Eastern Shore. </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 ORGANIZATION 2 us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> (1) ORGANIZATION Atlantic City Electric Company (ACE) is engaged in the transmission and distribution of electricity in southern New Jersey. ACE provides Default Electricity Supply, which is the supply of electricity at regulated rates to retail customers in its service territory who do not elect to purchase electricity from a competitive supplier. Default Electricity Supply is also known as Basic Generation Service. ACE is a wholly owned subsidiary of Conectiv, which is wholly owned by Pepco Holdings, Inc. (Pepco Holdings or PHI). </div> false false No definition available. No authoritative reference available. false false 1 12 false UnKnown UnKnown UnKnown false true