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Debt and Credit Agreements - Schedule of Long-term 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 Generation Co L L C [Member]  
Debt Instrument [Line Items]  
2020 3,182
2021 2
2022 1,024
2023 1
2024 792
Thereafter 2,942
Total 7,943
Commonwealth Edison Co [Member]  
Debt Instrument [Line Items]  
2020 500
2021 350
2022 0
2023 0
2024 250
Thereafter 7,691
Total 8,791
PECO Energy Co [Member]  
Debt Instrument [Line Items]  
2020 0
2021 300
2022 350
2023 50
2024 0
Thereafter 2,934
Total 3,634
Baltimore Gas and Electric Company [Member]  
Debt Instrument [Line Items]  
2020 0
2021 300
2022 250
2023 300
2024 0
Thereafter 2,450
Total 3,300
Pepco Holdings LLC [Member]  
Debt Instrument [Line Items]  
2020 103
2021 265
2022 314
2023 504
2024 553
Thereafter 4,256
Total 5,995
Potomac Electric Power Company [Member]  
Debt Instrument [Line Items]  
2020 2
2021 2
2022 311
2023 1
2024 401
Thereafter 2,180
Total 2,897
Delmarva Power & Light Company [Member]  
Debt Instrument [Line Items]  
2020 80
2021 2
2022 2
2023 502
2024 1
Thereafter 991
Total 1,578
Atlantic City Electric Company [Member]  
Debt Instrument [Line Items]  
2020 20
2021 261
2022 1
2023 1
2024 151
Thereafter 901
Total 1,335
Transition Bonds [Member] | Atlantic City Electric Company [Member]  
Debt Instrument [Line Items]  
2020 19
2021 21
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