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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Pension Plans |  |
Pension and Other Postretirement Benefits |  |
Service cost | $ 34 | $ 31
Non-service cost |  |
Interest cost | 26 | 31
Expected return on plan assets | (56) | (54)
Amortization of net loss | 3 | 3
Regulatory adjustment (deferred) | 4 | 2
Total non-service benefit | (23) | (18)
Total expense recognized | 11 | 13
Postretirement Benefits Other Than Pensions |  |
Pension and Other Postretirement Benefits |  |
Service cost | 10 | 9
Non-service cost |  |
Interest cost | 14 | 17
Expected return on plan assets | (27) | (30)
Amortization of net loss | (8) | (4)
Regulatory adjustment (deferred) | 11 | 8
Total non-service benefit | (10) | (9)
SCE |  |
Non-service cost |  |
Total non-service benefit | (33) | (28)
SCE | Pension Plans |  |
Pension and Other Postretirement Benefits |  |
Service cost | 33 | 30
Non-service cost |  |
Interest cost | 24 | 28
Expected return on plan assets | (53) | (51)
Amortization of net loss | 2 | 2
Regulatory adjustment (deferred) | 4 | 2
Total non-service benefit | (23) | (19)
Total expense recognized | $ 10 | $ 11

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