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Risk Management and Hedging Activities - SPPC - Balance Sheet Location (Details) - SPPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 2 $ 2
Derivative liability (19) (35)
Total (17) (33)
Net regulatory asset (liability) on derivative contracts 17 33
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 2 2
Derivative liability 0 0
Total 2 2
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (10) (16)
Total (10) (16)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (9) (19)
Total $ (9) $ (19)