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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
2023 $ 1,802  
2024 1,317  
2025 1,414  
2026 1,613  
2027 1,021  
Thereafter 30,002  
Long-term Debt 37,169  
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 206 206
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2023 0  
2024 250  
2025 0  
2026 500  
2027 350  
Thereafter 9,743  
Long-term Debt 10,843  
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]    
2023 50  
2024 0  
2025 350  
2026 0  
2027 0  
Thereafter 4,459  
Long-term Debt 4,859  
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]    
2023 300  
2024 0  
2025 0  
2026 350  
2027 0  
Thereafter 3,600  
Long-term Debt 4,250  
Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
2023 591  
2024 564  
2025 242  
2026 13  
2027 21  
Thereafter 6,270  
Long-term Debt 7,701  
Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
2023 4  
2024 405  
2025 5  
2026 4  
2027 3  
Thereafter 3,379  
Long-term Debt 3,800  
Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
2023 584  
2024 6  
2025 84  
2026 6  
2027 15  
Thereafter 1,254  
Long-term Debt 1,949  
Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2023 3  
2024 153  
2025 153  
2026 3  
2027 3  
Thereafter 1,452  
Long-term Debt $ 1,767