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Derivatives and Risk Management (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Impact of non-performance risk on fair value of the net derivative liability position $ 3 $ 1
Commodity Contract    
Derivative [Line Items]    
Derivative asset (liability) $ (1,502)