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Commitments and Contingencies - Schedule of Equity Investment Commitments (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Guarantor Obligations [Line Items]  
Other Commitment $ 2,879
Exelon Generation Co L L C [Member]  
Guarantor Obligations [Line Items]  
Other Commitment 2,272
Equity Unit Purchase Agreements [Member] | Exelon Generation Co L L C [Member]  
Guarantor Obligations [Line Items]  
Other Commitment, Due in Next Twelve Months 12
Other Commitment, Due in Second Year 6
Other Commitment, Due in Third Year 3
Other Commitment $ 21