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Related-Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Related party transactions                
Long-term insurance receivable due from affiliate   $ 458   $ 458   $ 458   $ 465
SCE                
Related party transactions                
Wildfire insurance expense           450 $ 437  
SCE | Wildfire liability insurance | Edison Insurance Services-EIS                
Related party transactions                
Wildfire-related insurance premiums $ 273              
Insurance purchased but not reinsured $ 93              
Insurance income and related expense   22   44        
Prepaid insurance               106
Long-term insurance receivable due from affiliate   334   334   $ 334   $ 334
Wildfire insurance expense   $ 66 $ 40 $ 132 $ 79