XML 196 R77.htm IDEA: XBRL DOCUMENT v3.20.4
Accounts Receivable - Narrative (Details) - Sale of Accounts Receivable [Member] - USD ($)
$ in Millions
Feb. 17, 2021
Dec. 31, 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   1,139 $ 1,200
Cash proceeds received   500 500
Deferred purchase price   639 650
Subsequent Event [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Cash proceeds received $ 250    
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   1,139 1,200
Cash proceeds received   500 500
Deferred purchase price   $ 639 $ 650