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Related-Party Transactions (Details) - SCE - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
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          
Insurance income and related expense   $ 22        
Prepaid insurance   53       $ 106
Long-term insurance receivables due from affiliate   334       $ 334
Wildfire insurance expense   $ 66 $ 39