XML 106 R118.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt and Credit Agreements - Summary of Interest Coverage Ratios (Details)
Dec. 31, 2014
Debt Instrument [Line Items]  
Interest coverage ratio 919.00%exc_DebtCovenantActual
Exelon Generation Co L L C [Member]  
Debt Instrument [Line Items]  
Interest coverage ratio 1235.00%exc_DebtCovenantActual
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Commonwealth Edison Co [Member]  
Debt Instrument [Line Items]  
Interest coverage ratio 703.00%exc_DebtCovenantActual
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
PECO Energy Co [Member]  
Debt Instrument [Line Items]  
Interest coverage ratio 872.00%exc_DebtCovenantActual
/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember
Baltimore Gas and Electric Company [Member]  
Debt Instrument [Line Items]  
Interest coverage ratio 928.00%exc_DebtCovenantActual
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember