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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Debt Maturities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
2021 $ 1,819
2022 3,092
2023 859
2024 814
2025 2,215
Thereafter 28,107
Total 36,906
Exelon Corporate [Member]  
Debt Instrument [Line Items]  
2021 300
2022 1,150
2023 0
2024 0
2025 807
Thereafter 5,332
Total $ 7,589