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Accounts Receivable - Narrative (Details) - Sale of accounts receivable [Member] - USD ($)
$ in Millions
Mar. 31, 2021
Feb. 17, 2021
Dec. 31, 2020
Apr. 08, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Derecognized receivables transferred at fair value $ 1,301   $ 1,139 $ 1,200
Cash proceeds received 900 $ 250 500 500
DPP consideration 401   639 650
March 29, 2024        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Line of Credit Facility, Maximum borrowing capacity 900      
Cash proceeds received 150      
April 7, 2021        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Line of Credit Facility, Maximum borrowing capacity 750      
Exelon Generation Co L L C [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Derecognized receivables transferred at fair value 1,301   1,139 1,200
Cash proceeds received 900 $ 250 500 500
DPP consideration 401   $ 639 $ 650
Exelon Generation Co L L C [Member] | March 29, 2024        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Line of Credit Facility, Maximum borrowing capacity 900      
Cash proceeds received 150      
Exelon Generation Co L L C [Member] | April 7, 2021        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Line of Credit Facility, Maximum borrowing capacity $ 750