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Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Net gain or (loss) recognized in the statement of income offset by regulatory accounting $ (15) $ 112 $ 183 $ 151  
Derivative, Net Liability Position, Aggregate Fair Value 110   110    
Collateral Already Posted, Aggregate Fair Value 54   54    
Collateral cash requirement 60   60    
Purchased power and fuel 168 $ 185 370 $ 354  
Deposits, Wholesale 208   208   $ 58
Deposits 20   20    
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 3   3    
Letters of Credit Outstanding, Amount 91   91    
Derivative, Collateral, Right to Reclaim Cash 33   33    
Pledged Assets Separately Reported, Securities Pledged under Letter of Credit Facilities, at Fair Value 21   21    
Derivative Asset, Fair Value, Amount Offset Against Collateral 228   228    
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