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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, SCE (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
SCE:              
Beginning balance           $ 15,565  
Pension and PBOP:              
Other comprehensive income, net of tax $ 0 $ 2 $ 2 $ 1   2 $ 3
Ending Balance 17,155         17,155  
Accumulated Other Comprehensive Income              
Pension and PBOP:              
Other comprehensive income, net of tax   2 2 1      
Reclassified from accumulated other comprehensive loss              
Pension and PBOP:              
Reclassified from accumulated other comprehensive loss 0   1     1 2
SCE              
SCE:              
Beginning balance 22,395 22,875 21,262 21,097 $ 21,404 21,751 21,404
Pension and PBOP:              
Other comprehensive income, net of tax 0 1 1   1 1 2
Ending Balance 22,861 22,395 21,474 21,262 21,097 22,861 21,474
SCE | Accumulated Other Comprehensive Income              
SCE:              
Beginning balance (8) (9) (11) (11) (12) (9) (12)
Pension and PBOP:              
Other comprehensive income, net of tax   1 1   1    
Ending Balance (8) $ (8) (10) $ (11) $ (11) (8) (10)
SCE | Reclassified from accumulated other comprehensive loss              
Pension and PBOP:              
Reclassified from accumulated other comprehensive loss $ 0   $ 1     $ 1 $ 2