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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capitalized interest $ 8us-gaap_InterestPaidCapitalized $ 7us-gaap_InterestPaidCapitalized $ 8us-gaap_InterestPaidCapitalized
Potomac Electric Power Co [Member]      
Capitalized interest 5us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_PotomacElectricPowerCoMember		 5us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_PotomacElectricPowerCoMember		 4us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_PotomacElectricPowerCoMember
Delmarva Power & Light Co/De [Member]      
Capitalized interest 1us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_DelmarvaPowerLightCoMember		 2us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_DelmarvaPowerLightCoMember		 2us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_DelmarvaPowerLightCoMember
Atlantic City Electric Co [Member]      
Capitalized interest $ 1us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_AtlanticCityElectricCoMember		 $ 1us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_AtlanticCityElectricCoMember		 $ 2us-gaap_InterestPaidCapitalized
/ dei_LegalEntityAxis
= pom_AtlanticCityElectricCoMember