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Risk Management (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 41 $ 28  
Net gain or loss recognized in the statement of income offset by regulatory accounting 5 (403) $ (188)
Margin Deposit Assets 15    
Right to reclaim cash collateral 16 1  
Derivative, Collateral, Obligation to Return Cash 5 $ 5  
Derivative, Collateral, Obligation to Return Securities 24    
Derivative Asset, Fair Value, Amount Offset Against Collateral 29    
Credit Risk Contract [Member]      
Derivative [Line Items]      
Derivative, Net Liability Position, Aggregate Fair Value 194    
Collateral Already Posted, Aggregate Fair Value 70    
Collateral Aggregate Fair Value $ 126