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Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - NPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 3 $ 4
Derivative liability (69) (117)
Total (66) (113)
Net regulatory asset (liability) on derivative contracts 66 113
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 3 4
Derivative liability 0 0
Total 3 4
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (37) (55)
Total (37) (55)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (32) (62)
Total $ (32) $ (62)