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Compensation and Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plans        
Pension and Other Postretirement Benefits        
Service cost $ 23 $ 24 $ 69 $ 72
Non-service cost (benefit)        
Interest cost 48 44 144 132
Expected return on plan assets (58) (58) (174) (176)
Amortization of net loss (gain) 1 0 2 2
Regulatory adjustment (8) (5) (23) (15)
Total non-service benefit (17) (19) (51) (57)
Total expense 6 5 18 15
Postretirement Benefits Other Than Pensions ("PBOP")        
Pension and Other Postretirement Benefits        
Service cost 3 3 9 9
Non-service cost (benefit)        
Interest cost 10 9 30 27
Expected return on plan assets (27) (28) (81) (84)
Amortization of net loss (gain) (20) (24) (60) (72)
Regulatory adjustment 34 40 102 120
Total non-service benefit (3) (3) (9) (9)
Total expense 0 0 0 0
SCE        
Non-service cost (benefit)        
Total non-service benefit (21) (22) (63) (66)
SCE | Pension Plans        
Pension and Other Postretirement Benefits        
Service cost 23 24 69 72
Non-service cost (benefit)        
Interest cost 45 41 134 122
Expected return on plan assets (55) (56) (165) (166)
Amortization of net loss (gain) 0 1 0 2
Regulatory adjustment (8) (5) (23) (15)
Total non-service benefit (18) (19) (54) (57)
Total expense $ 5 $ 5 $ 15 $ 15