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Accounts Receivable Accounts Receivable - Narrative (Details) - Sale of accounts receivable [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Apr. 08, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 750  
Derecognized receivables transferred at fair value 1,232 $ 1,200
Cash proceeds received 500 500
Deferred purchase price 732 650
Exelon Generation Co L L C [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 750  
Derecognized receivables transferred at fair value 1,232 1,200
Cash proceeds received 500 500
Deferred purchase price $ 732 $ 650