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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
2022 $ 2,153  
2023 864  
2024 817  
2025 1,322  
2026 1,611  
Thereafter 25,888  
Long-term Debt 32,655  
Long-term debt to financing trusts 390 $ 390
Long-term debt to financing trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 390 390
ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 206
ComEd Financing III Affiliate [Member] | Long-term debt to financing trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts   206
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2022 0  
2023 0  
2024 250  
2025 0  
2026 500  
Thereafter 9,342  
Long-term Debt 10,092  
Long-term debt to financing trusts 205 205
Commonwealth Edison Co [Member] | Long-term debt to financing trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 206
Commonwealth Edison Co [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 205 205
Commonwealth Edison Co [Member] | ComEd Financing III Affiliate [Member] | Long-term debt to financing trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 206
PECO Energy Co [Member]    
Debt Instrument [Line Items]    
2022 350  
2023 50  
2024 0  
2025 350  
2026 0  
Thereafter 3,684  
Long-term Debt 4,434  
Long-term debt to financing trusts 184 184
PECO Energy Co [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 0 $ 0
PECO Energy Co [Member] | PECO Financing Trusts [Member] | Long-term debt to financing trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 184  
Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
2022 250  
2023 300  
2024 0  
2025 0  
2026 350  
Thereafter 3,100  
Long-term Debt 4,000  
Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
2022 399  
2023 512  
2024 562  
2025 162  
2026 11  
Thereafter 5,438  
Long-term Debt 7,084  
Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
2022 313  
2023 4  
2024 404  
2025 4  
2026 4  
Thereafter 2,757  
Long-term Debt 3,486  
Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
2022 83  
2023 505  
2024 5  
2025 5  
2026 4  
Thereafter 1,219  
Long-term Debt 1,821  
Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2022 3  
2023 3  
2024 153  
2025 153  
2026 3  
Thereafter 1,277  
Long-term Debt $ 1,592