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Related-Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Related party transactions        
Long-term insurance receivables $ 418 $ 501    
SCE        
Related party transactions        
Wildfire insurance expense     $ 450  
Subsidiary of Common Parent | SCE        
Related party transactions        
Contribution expense 19      
Wildfire liability insurance | Subsidiary of Common Parent | SCE        
Related party transactions        
Wildfire-related insurance premiums 0 0   $ 273
Insurance purchased but not reinsured     $ 93  
Insurance income and related expense 44      
Long-term insurance receivables 303 355    
Wildfire insurance expense $ 132 $ 213