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Risk Management (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative [Line Items]      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 28 $ 5  
Net gain or loss recognized in the statement of income offset by regulatory accounting (403) (188) $ (119)
Margin Deposit Assets 26    
Right to reclaim cash collateral 1 0  
Derivative, Collateral, Obligation to Return Cash 5 $ 140  
Derivative, Collateral, Obligation to Return Securities 12    
Derivative Asset, Fair Value, Amount Offset Against Collateral 17    
Credit Risk Contract [Member]      
Derivative [Line Items]      
Derivative, Net Liability Position, Aggregate Fair Value 217    
Collateral Already Posted, Aggregate Fair Value 95    
Collateral Aggregate Fair Value 166    
Right to reclaim cash collateral $ 55    
Letter of Credit [Member] | Credit Risk Contract [Member]      
Derivative [Line Items]      
Collateral posted as letter of credit 40 million