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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, 2019
USD ($)
Debt Instrument [Line Items]  
2020 $ 4,710
2021 1,517
2022 3,088
2023 855
2024 1,596
Thereafter 24,184
Total 35,950
Exelon Corporate [Member]  
Debt Instrument [Line Items]  
2020 1,458
2021 300
2022 1,150
2023 0
2024 0
Thereafter 4,131
Total $ 7,039