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Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - NPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 4 $ 23
Derivative liability (120) (75)
Total (116) (52)
Net regulatory asset (liability) on derivative contracts 116 52
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 4 23
Derivative liability 0 0
Total 4 23
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (90) (51)
Total (90) (51)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (30) (24)
Total $ (30) $ (24)