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Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Net gain or (loss) recognized in the statement of income offset by regulatory accounting $ (45) $ 114 $ 138 $ 265  
Derivative, Net Liability Position, Aggregate Fair Value 119   119    
Collateral Already Posted, Aggregate Fair Value 38   38    
Collateral cash requirement 76   76    
Purchased power and fuel 337 $ 259 707 $ 613  
Deposits, Wholesale 102   102   $ 58
Deposits 18   18    
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 3   3    
Letters of Credit Outstanding, Amount 91   91    
Derivative, Collateral, Right to Reclaim Cash 21   21    
Off-Balance-Sheet, Credit Loss, Liability 17   17    
Derivative Asset, Fair Value, Amount Offset Against Collateral 120   120    
Electricity [Member]          
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 1   1    
Natural Gas [Member]          
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 2   $ 2