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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 1,819  
2022 3,092  
2023 859  
2024 814  
2025 2,215  
Thereafter 28,107  
Long-term Debt 36,906  
Long-term debt to financing trusts 390 $ 390
Long-term debt to financing trusts    
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    
Debt Instrument [Line Items]    
Long-term debt to financing trusts   206
Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
2021 197  
2022 1,025  
2023 1  
2024 1  
2025 900  
Thereafter 3,948  
Long-term Debt 6,072  
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2021 350  
2022 0  
2023 0  
2024 250  
2025 0  
Thereafter 8,692  
Long-term Debt 9,292  
Long-term debt to financing trusts 205 205
Commonwealth Edison Co [Member] | Long-term debt to financing trusts    
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    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 206
PECO Energy Co [Member]    
Debt Instrument [Line Items]    
2021 300  
2022 350  
2023 50  
2024 0  
2025 350  
Thereafter 2,934  
Long-term Debt 3,984  
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    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 184  
Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
2021 300  
2022 250  
2023 300  
2024 0  
2025 0  
Thereafter 2,850  
Long-term Debt 3,700  
Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
2021 347  
2022 317  
2023 508  
2024 558  
2025 158  
Thereafter 4,608  
Long-term Debt 6,496  
Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
2021 3  
2022 312  
2023 3  
2024 403  
2025 3  
Thereafter 2,479  
Long-term Debt 3,203  
Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
2021 82  
2022 3  
2023 503  
2024 3  
2025 3  
Thereafter 1,093  
Long-term Debt 1,687  
Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2021 261  
2022 2  
2023 2  
2024 152  
2025 152  
Thereafter 852  
Long-term Debt $ 1,421