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Commitments and Contingencies - Schedule of Equity Investment Commitments (Details) (Equity Method Investments [Member], Exelon Generation Co L L C [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Equity Method Investments [Member] | Exelon Generation Co L L C [Member]
  
Guarantor Obligations [Line Items]  
2015 $ 98us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ invest_InvestmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
2016 38us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ invest_InvestmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
2017 20us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ invest_InvestmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
2018 11us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ invest_InvestmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Total $ 167us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ invest_InvestmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember