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Fair Value of FInancial Instruments Fair Value Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized losses $ (50) $ 38  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (2) (2)  
Net liabilities from price risk management activities as of end of year 85 137 $ 97
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting (55) 47  
Net realized losses $ 5 $ 9