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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, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 1,349
2020 3,528
2021 1,511
2022 3,084
2023 850
Thereafter 24,979 [1]
Total 35,301
Exelon Corporate [Member]  
Debt Instrument [Line Items]  
2019 0
2020 1,450
2021 300
2022 1,150
2023 0
Thereafter 4,139
Total $ 7,039
[1] Includes $390 million due to ComEd and PECO financing trusts.