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Risk Management and Hedging Activities - SPPC - Balance Sheet Location (Details) - SPPC - Commodity derivatives - Not designated as hedging contracts - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement $ 2 $ 9
Derivative liability, not subject to master netting arrangement (35) (2)
Derivative, fair value, net (33) 7
Net regulatory asset (liability) on derivative contracts 33 (7)
Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement 2 9
Derivative liability, not subject to master netting arrangement 0 0
Derivative, fair value, net 2 9
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement 0 0
Derivative liability, not subject to master netting arrangement (16) 0
Derivative, fair value, net (16) 0
Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, not subject to master netting arrangement 0 0
Derivative liability, not subject to master netting arrangement (19) (2)
Derivative, fair value, net $ (19) $ (2)