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Risk Management and Hedging Activities - SPPC - Balance Sheet Location (Details) - SPPC - Commodity derivatives - Not Designated as Hedging - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   $ 8
Derivative liability   (21)
Total $ (36) (13)
Net regulatory asset (liability) on derivative contracts 36 13
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   8
Derivative liability   0
Total 0 8
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   0
Derivative liability   (14)
Total (31) (14)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross   0
Derivative liability   (7)
Total $ (5) $ (7)