Debt and Credit Agreements - Summary of Interest Coverage Ratios (Details)	Dec. 31, 2015
Debt Instrument [Line Items]
Interest coverage ratio	977.00%
Exelon Generation Co L L C [Member]
Debt Instrument [Line Items]
Interest coverage ratio	1231.00%
Commonwealth Edison Co [Member]
Debt Instrument [Line Items]
Interest coverage ratio	725.00%
PECO Energy Co [Member]
Debt Instrument [Line Items]
Interest coverage ratio	894.00%
Baltimore Gas and Electric Company [Member]
Debt Instrument [Line Items]
Interest coverage ratio	1066.00%