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Income Taxes - Schedule of Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Tax        
Income from operations before income taxes $ 1,063 $ 645 $ 3,387 $ 1,152
Statutory tax rate (as a percent) 21.00% 21.00% 21.00% 21.00%
Provision for income tax at federal statutory rate of 21% $ 223 $ 136 $ 711 $ 242
Increase (decrease) in income tax from:        
State tax, net of federal tax effect 43 12 134 (18)
Property-related (72) (78) (198) (195)
Other (19) (2) (38) (15)
Total income tax expense $ 175 $ 68 $ 609 $ 14
Effective tax rate 16.50% 10.50% 18.00% 1.20%
SCE        
Income Tax        
Income from operations before income taxes $ 1,162 $ 736 $ 3,741 $ 1,413
Statutory tax rate (as a percent) 21.00% 21.00% 21.00% 21.00%
Provision for income tax at federal statutory rate of 21% $ 244 $ 155 $ 786 $ 297
Increase (decrease) in income tax from:        
State tax, net of federal tax effect 50 18 156 0
Property-related (72) (78) (198) (195)
Other (19) 0 (39) (8)
Total income tax expense $ 203 $ 95 $ 705 $ 94
Effective tax rate 17.50% 12.90% 18.80% 6.70%