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Derivative Financial Instruments Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 645 $ 982
Derivative, Collateral, Right to Reclaim Securities 224 264
Derivative, Collateral, Obligation to Return Cash 110 103
Derivative, Collateral, Obligation to Return Securities 76 112
Incremental Collateral For Loss Of Investment Grade Credit Rating 1,319 1,509
Exelon Generation Co L L C [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Collateral, Right to Reclaim Cash 645 982
Derivative, Collateral, Right to Reclaim Securities 224 264
Derivative, Collateral, Obligation to Return Cash 110 103
Derivative, Collateral, Obligation to Return Securities 76 112
Incremental Collateral For Loss Of Investment Grade Credit Rating $ 1,319 $ 1,509