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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, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   $ 4
Derivative liability $ (168) (117)
Total (168) (113)
Net regulatory asset (liability) on derivative contracts 168 113
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   4
Derivative liability 0 0
Total 0 4
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   0
Derivative liability (88) (55)
Total (88) (55)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   0
Derivative liability (80) (62)
Total $ (80) $ (62)