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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, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 1  
Derivative liability (27) $ (16)
Total derivative asset (liability) (26)  
Net regulatory asset (liability) on derivative contracts 26 16
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0  
Derivative liability 0 0
Total derivative asset (liability) 0  
Derivative Contracts - Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 0  
Derivative liability (26) (16)
Total derivative asset (liability) (26)  
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 1  
Derivative liability (1) $ 0
Total derivative asset (liability) $ 0