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Nuclear Decommissioning - Noncurrent Related Party Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Asset Retirement Obligations [Line Items]    
Payables related to Regulatory Agreement Units $ 3,069 $ 2,897
ComEd    
Asset Retirement Obligations [Line Items]    
Payables related to Regulatory Agreement Units 2,804 2,660
PECO    
Asset Retirement Obligations [Line Items]    
Payables related to Regulatory Agreement Units $ 265 $ 237