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Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net gain or (loss) recognized in the statement of income offset by regulatory accounting $ (37) $ (74)    
Derivative, Net Liability Position, Aggregate Fair Value 167   $ 167  
Collateral Already Posted, Aggregate Fair Value 76   76  
Collateral cash requirement 114   114  
Purchased power and fuel 380 $ 386 1,060 $ 910
Letters of Credit Outstanding, Amount 82   82  
Derivative, Collateral, Right to Reclaim Cash 61   61  
Off-Balance-Sheet, Credit Loss, Liability 15   15  
Derivative Asset, Fair Value, Amount Offset Against Collateral 22   $ 22  
Credit Risk Contract        
Net gain or (loss) recognized in the statement of income offset by regulatory accounting $ 21