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Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - NPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 1 $ 4
Derivative liability (176) (117)
Total (175) (113)
Net regulatory asset (liability) on derivative contracts 175 113
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 4
Derivative liability 0 0
Total 0 4
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 1 0
Derivative liability 0 0
Total 1 0
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (122) (55)
Total (122) (55)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (54) (62)
Total $ (54) $ (62)