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Risk Management and Hedging Activities - SPPC - Balance Sheet Location (Details) - SPPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 1 $ 8
Derivative liability (34) (21)
Total (33) (13)
Net regulatory asset (liability) on derivative contracts 33 13
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 1 8
Derivative liability 0 0
Total 1 8
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (27) (14)
Total (27) (14)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0 0
Derivative liability (7) (7)
Total $ (7) $ (7)