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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Common stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized 2,000,000,000us-gaap_CommonStockSharesAuthorized 2,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 859,833,343us-gaap_CommonStockSharesOutstanding 857,290,484us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares held 35,000,000us-gaap_TreasuryStockShares 35,000,000us-gaap_TreasuryStockShares
Commonwealth Edison Co [Member]    
Common stock, shares authorized 250,000,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember		  
Common stock, shares outstanding 127,016,947us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember		 127,016,896us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
PECO Energy Co [Member]    
Common stock, shares authorized 500,000,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember		  
Common stock, shares outstanding 170,478,507us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember		 170,478,507us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember
Baltimore Gas and Electric Company [Member]    
Common stock, shares authorized 175,000,000us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		  
Common stock, shares outstanding 1,000us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 1,000us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember