2.2.0.25truefalse10601 - Disclosure - GOODWILLtruefalsefalse1falsefalseUSDtruefalse{dei_LegalEntityAxis} : PEPCO HOLDINGS INC 1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_12_31_20105http://www.sec.gov/CIK0001135971duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePEPCO HOLDINGS INCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ParentCompanyMemberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$1false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.pepcoholdings.com/taxonomy/role/disclosuregoodwill1falsefalsefalse00falsefalsefalsefalsefalse1falsefalseUSDtruefalse{dei_LegalEntityAxis} : PEPCO HOLDINGS INC 1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_12_31_20105http://www.sec.gov/CIK0001135971duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePEPCO HOLDINGS INCdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ParentCompanyMemberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalsePEPCO HOLDINGS INC2false0pom_GoodwillDisclosureTextBlockpomfalsenadurationThis block of text may be used to disclose all or part of the information related to goodwill.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00<div> (6) GOODWILL Substantially all of PHI's $1.4 billion goodwill balance was generated by Pepco's acquisition of Conectiv in 2002 and is allocated entirely to the Power Delivery reporting unit based on the aggregation of its regulated public utility company components for purposes of assessing impairment under FASB guidance on goodwill and other intangibles (ASC 350). PHI's annual impairment test as of November 1, 2010 indicated that goodwill was not impaired. As of December 31, 2010, after review of its significant assumptions in the goodwill impairment analysis, PHI concluded that there were no events requiring it to perform an interim goodwill impairment test. Although PHI's market capitalization was below book value at December 31, 2010, PHI's market capitalization has improved compared to earlier periods when it performed interim impairment tests. PHI performed its previous annual goodwill impairment test as of November 1, 2009, and interim impairment tests as of March 31, 2009 and December 31, 2008 when its market capitalization was further below book value than at November 1, 2009. PHI concluded that its goodwill was not impaired at those earlier dates. In order to estimate the fair value of its Power Delivery reporting unit, PHI uses two valuation techniques: an income approach and a market approach. The income approach estimates fair value based on a discounted cash flow analysis using estimated future cash flows and a terminal value that is consistent with Power Delivery's long-term view of the business. This approach uses a discount rate based on the estimated weighted average cost of capital (WACC) for the reporting unit. PHI determines the estimated WACC by considering market-based information for the cost of equity and cost of debt that is appropriate for the Power Delivery business as of the measurement date. The market approach estimates fair value based on a multiple of earnings before interest, taxes, depreciation, and amortization (EBITDA) that management believes is consistent with EBITDA multiples for comparable utilities. PHI has consistently used this valuation framework to estimate the fair value of Power Delivery. The estimation of fair value is dependent on a number of factors that are derived from the Power Delivery reporting unit's business forecast, including but not limited to interest rates, growth assumptions, returns on rate base, operating and capital expenditure requirements, and other factors, changes in which could materially affect the results of impairment testing. Assumptions used in the models were consistent with historical experience, including assumptions concerning the recovery of operating costs and capital expenditures. Sensitive, interrelated and uncertain variables that could decrease the estimated fair value of the Power Delivery reporting unit include utility sector market performance, sustained adverse business conditions, changes in forecasted revenues, higher operating and maintenance capital expenditure requirements, a significant increase in the cost of capital and other factors. In addition to estimating the fair value of its Power Delivery reporting unit, PHI estimated the fair value of its other reporting units (Pepco Energy Services, Other Non-Regulated, and Corporate and Other) at November 1, 2010. The sum of the fair value of all reporting units was reconciled to PHI's market capitalization at November 1, 2010 to corroborate estimates of the fair value of its reporting units. The sum of the estimated fair values of all reporting units exceeded the market capitalization of PHI at November 1, 2010. PHI believes that the excess of the estimated fair value of PHI's reporting units as compared to PHI's market capitalization reflects a reasonable control premium that is comparable to control premiums observed in historical acquisitions in the utility industry during various economic environments. Given the lack of a fundamental change in the Power Delivery reporting unit's business, PHI does not believe that the decline in its stock price since mid-2008 indicated a commensurate decline in the fair value of PHI's Power Delivery reporting unit. PHI's Power Delivery reporting unit consists of regulated companies with regulated recovery rates and approved rates of return allowing for generally predictable and steady streams of revenues and cash flows over an extended period of time.   PHI will continue to closely monitor for indicators of goodwill impairment, including the sustained period of time that PHI's stock price has been below its book value. As discussed in Note (1), "Organization," on December 7, 2009, PHI announced the wind-down of the Pepco Energy Services retail energy supply business. As a result of this decision, PHI determined that all goodwill allocated to this business was impaired and therefore, PHI recorded a goodwill impairment charge of $4 million in the fourth quarter of 2009 to write-off the goodwill associated with this business. A roll forward of PHI's goodwill balance is set forth below in millions of dollars:   <table border="0" cellspacing="0" cellpadding="0" width="68%" align="center"> <tr><td width="89%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance, December 31, 2008</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,411</td> <td valign="bottom" nowrap="nowrap"> </td></tr> <tr><td valign="top"> Less: Impairment charge associated with wind-down of Pepco Energy Services retail energy business</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(4</td> <td valign="bottom" nowrap="nowrap">)</td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-top: #000000 1px solid;" valign="bottom"> </td> <td style="border-top: #000000 1px solid;" valign="bottom"> </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance, December 31, 2009</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,407</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Less: Adjustments</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-top: #000000 1px solid;" valign="bottom"> </td> <td style="border-top: #000000 1px solid;" valign="bottom"> </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance, December 31, 2010</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,407</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-top: #000000 3px double;" valign="bottom"> </td> <td style="border-top: #000000 3px double;" valign="bottom"> </td> <td> </td></tr></table> </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis block of text may be used to disclose all or part of the information related to goodwill.No authoritative reference available.falsefalseGOODWILL3false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.pepcoholdings.com/taxonomy/role/disclosuregoodwill1falsefalsefalse00falsefalsefalsefalsefalse2falsefalseUSDtruefalse{dei_LegalEntityAxis} : DELMARVA POWER & LIGHT CO /DE/ 1/1/2010 - 12/31/2010 USD ($) $Duration_1_1_2010_To_12_31_20103http://www.sec.gov/CIK0001135971duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseDELMARVA POWER & LIGHT CO /DE/dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipom_DelmarvaPowerLightCoMemberdei_LegalEntityAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseDELMARVA POWER & LIGHT CO /DE/4false0pom_GoodwillDisclosureTextBlockpomfalsenadurationThis block of text may be used to disclose all or part of the information related to goodwill.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00<div> (6) GOODWILL DPL's goodwill balance of $8 million was unchanged during the year ended December 31, 2010. All of DPL's goodwill was generated by its acquisition of Conowingo Power Company in 1995. DPL's annual impairment test as of November 1, 2010 indicated that goodwill was not impaired. As of December 31, 2010, after review of its significant assumptions in the goodwill impairment analysis, DPL concluded that there were no events requiring it to perform an interim goodwill impairment test. DPL performed its previous annual goodwill impairment test as of November 1, 2009, which indicated that goodwill was not impaired. In order to estimate the fair value of DPL's business, DPL uses two valuation techniques: an income approach and a market approach. The income approach estimates fair value based on a discounted cash flow analysis using estimated future cash flows and a terminal value that is consistent with DPL's long-term view of the business. This approach uses a discount rate based on the estimated weighted average cost of capital (WACC) for the reporting unit. DPL determines the estimated WACC by considering market-based information for the cost of equity and cost of debt as of the measurement date appropriate for DPL's business. The market approach estimates fair value based on a multiple of earnings before interest, taxes, depreciation, and amortization (EBITDA) that management believes is consistent with EBITDA multiples for comparable utilities. DPL has consistently used this valuation framework to estimate the fair value of DPL's business. The estimation of fair value is dependent on a number of factors that are derived from the DPL business forecast, including but not limited to interest rates, growth assumptions, returns on rate base, operating and capital expenditure requirements, and other factors, changes in which could materially affect the results of impairment testing. Assumptions used in the models were consistent with historical experience, including assumptions concerning the recovery of operating costs and capital expenditures. Sensitive, interrelated and uncertain variables that could decrease the estimated fair value of the DPL business include utility sector market performance, sustained adverse business conditions, changes in forecasted revenues, higher operating and maintenance capital expenditure requirements, a significant increase in the cost of capital and other factors. </div>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis block of text may be used to disclose all or part of the information related to goodwill.No authoritative reference available.falsefalseGOODWILL14GOODWILLUnKnownUnKnownUnKnownUnKnownfalsetrue