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Related-Party Transactions (Details) - SCE - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2021
Related party transactions                
Wildfire insurance expense           $ 450 $ 437  
Wildfire liability insurance | Edison Insurance Services-EIS                
Related party transactions                
Wildfire-related insurance premiums $ 273              
Insurance purchased but not reinsured $ 93              
Prepaid insurance   $ 160   $ 160       $ 52
Long-term insurance receivables due from affiliate   334   334        
Wildfire insurance expense   $ 67 $ 41 $ 146 $ 128