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Related-Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Related party transactions        
Long-term insurance receivable due from affiliate $ 501   $ 465  
SCE        
Related party transactions        
Wildfire insurance expense   $ 450    
SCE | Wildfire liability insurance | Edison Insurance Services-EIS        
Related party transactions        
Wildfire-related insurance premiums 0   273 $ 185
Insurance purchased but not reinsured   $ 93    
Insurance income and related expense 44      
Prepaid insurance     106  
Long-term insurance receivable due from affiliate 355   334  
Wildfire insurance expense $ 132   $ 213 $ 192