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Price Risk Management (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 3 $ 2  
Net gain or loss recognized in the statement of income offset by regulatory accounting (119) 12 $ 2
Margin Deposit Assets 14    
Right to reclaim cash collateral 0 0  
Derivative, Collateral, Obligation to Return Cash 58 0  
Derivative, Collateral, Obligation to Return Securities 10    
Derivative Asset, Fair Value, Amount Offset Against Collateral 68    
Credit Risk Contract [Member]      
Derivative [Line Items]      
Derivative, Net Liability Position, Aggregate Fair Value 128    
Collateral Already Posted, Aggregate Fair Value 38    
Collateral Aggregate Fair Value 101    
Right to reclaim cash collateral $ 20    
Letter of Credit [Member] | Credit Risk Contract [Member]      
Derivative [Line Items]      
Collateral posted as letter of credit 18 million    
Electricity [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 1 1  
Natural Gas [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 2 $ 1