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Debt and Credit Agreements - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
MW
Dec. 31, 2020
USD ($)
Short-term Loan Agreements [Abstract]    
Long-term Debt, Current Maturities $ 3,373 $ 1,819
Nonrecourse Debt [Abstract]    
Debt Instrument, Collateral Amount 2,000  
Long-term Debt 38,756  
Long-term debt, gross $ 38,366 36,516
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]    
Nonrecourse Debt [Abstract]    
Debt Instrument, Basis Spread on Variable Rate 0.90%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]    
Nonrecourse Debt [Abstract]    
Debt Instrument, Basis Spread on Variable Rate 1.275%  
DOE Project Financing, 2.82% January 5, 2037 [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Long-term line of credit/facility draws $ 646  
Debt, Weighted Average Interest Rate 2.82%  
Non-recourse debt $ 435 460
Letters of Credit Outstanding, Amount $ 37  
Debt Instrument, Basis Spread on Variable Rate 0.375%  
Continetal Wind [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Line of Credit Facility, Maximum Borrowing Capacity $ 122  
Non-recourse debt 380 415
Letters of Credit Outstanding, Amount 115  
Debt Instrument, Face Amount $ 613  
Non Recourse Debt Megawatts | MW 667  
Debt instrument, interest rate, stated percentage 6.00%  
Aggregate Bank Commitments Under Unsecured Revolving Credit Facilities $ 4  
Renewable Power Generation [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Non-recourse debt 90 95
Debt Instrument, Face Amount $ 150  
Debt instrument, interest rate, stated percentage 4.11%  
SolGen [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Non-recourse debt $ 125  
Debt Instrument, Face Amount 150  
ExGenRenewablesIVNov2024 [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Non-recourse debt 709  
Long-term Debt 850  
Non Recourse Debt Interest Rate Swap $ 636  
Non Recourse Debt Hedge Percentage 2.32%  
ExGenRenewablesIVDec2020 [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Debt instrument, interest rate, stated percentage 2.50%  
Long-term Debt $ 750  
Non Recourse Debt Interest Rate Swap $ 516  
Non Recourse Debt Hedge Percentage 1.05%  
Non Recourse Debt Minimum Rate 1.00%  
Long-term debt, gross $ 735 750
West Medway II, LLC [Member] | Non Recourse Debt [Member]    
Nonrecourse Debt [Abstract]    
Line of Credit Facility, Maximum Borrowing Capacity $ 150  
Debt instrument, interest rate, stated percentage 3.00%  
Non Recourse Debt Interest Rate Swap $ 113  
Non Recourse Debt Hedge Percentage 0.61%  
Long-term debt, gross $ 135  
Corporate, Non-Segment [Member]    
Short-term Loan Agreements [Abstract]    
Long-term Debt, Current Maturities 1,150 300
Notes Receivable, Related Parties 319 324
Nonrecourse Debt [Abstract]    
Long-term Debt 7,289  
Long-term debt, gross 7,289 7,589
Due from Affiliate, Noncurrent $ 319 324
Corporate, Non-Segment [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Nonrecourse Debt [Abstract]    
Debt Instrument, Basis Spread on Variable Rate 1.275%  
Corporate, Non-Segment [Member] | ShortTermDebt03232017 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 500  
Corporate, Non-Segment [Member] | ShortTermDebt03232017 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.65  
Corporate, Non-Segment [Member] | ShortTermDebt03242021 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 200  
Corporate, Non-Segment [Member] | ShortTermDebt03242021 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.65  
Corporate, Non-Segment [Member] | ShortTermDebt03312021.1 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 150  
Corporate, Non-Segment [Member] | ShortTermDebt03312021.1 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.65  
Corporate, Non-Segment [Member] | ShortTermDebt03312021.2 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 150  
Corporate, Non-Segment [Member] | ShortTermDebt03312021.2 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.65  
Exelon Generation Co L L C [Member] | ShortTermDebt03192020 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 200  
Exelon Generation Co L L C [Member] | ShortTermDebt03192020 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.875  
Exelon Generation Co L L C [Member] | ShortTermDebt03312020 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 300  
Exelon Generation Co L L C [Member] | ShortTermDebt03312020 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.70  
Exelon Generation Co L L C [Member] | ShortTermDebt08062021 [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 880  
Exelon Generation Co L L C [Member] | ShortTermDebt08062021 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.875  
Exelon Generation Co L L C [Member] | ShortTermDebt08062021 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 1  
Commonwealth Edison Co [Member]    
Short-term Loan Agreements [Abstract]    
Long-term Debt, Current Maturities $ 0 350
Nonrecourse Debt [Abstract]    
Long-term Debt 10,092  
Long-term debt, gross $ 9,887 9,087
Commonwealth Edison Co [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Nonrecourse Debt [Abstract]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Commonwealth Edison Co [Member] | ShortTermDebt01252021.1    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 125  
Commonwealth Edison Co [Member] | ShortTermDebt01252021.1 | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.50  
Commonwealth Edison Co [Member] | ShortTermDebt01252021.2    
Short-term Loan Agreements [Abstract]    
Short-Term Loans $ 125  
Commonwealth Edison Co [Member] | ShortTermDebt01252021.2 | London Interbank Offered Rate (LIBOR) [Member]    
Short-term Loan Agreements [Abstract]    
Short-Term Loans, Interest rate terms 0.75  
Delmarva Power & Light Company [Member]    
Short-term Loan Agreements [Abstract]    
Long-term Debt, Current Maturities $ 79 79
Nonrecourse Debt [Abstract]    
Long-term Debt 1,821  
Long-term debt, gross $ 1,821 $ 1,687
Delmarva Power & Light Company [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Nonrecourse Debt [Abstract]    
Debt Instrument, Basis Spread on Variable Rate 1.00%