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Compensation and Benefit Plans (Expenses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | $ 130 | $ 121 | $ 114
Non-service cost (benefit) |  |  |
Interest cost | 103 | 124 | 155
Expected return on plan assets | (222) | (215) | (205)
Amortization of prior service cost | 1 | 2 | 2
Amortization of net (gain) loss | 11 | 10 | 7
Regulatory adjustment | 25 | 16 | (3)
Total non-service benefit | (82) | (63) | (44)
Total expense recognized | 48 | 58 | 70
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 40 | 38 | 30
Non-service cost (benefit) |  |  |
Interest cost | 52 | 63 | 77
Expected return on plan assets | (106) | (119) | (111)
Amortization of prior service cost | (1) | (1) | (1)
Amortization of net (gain) loss | (35) | (29) | (17)
Regulatory adjustment | 51 | 49 | 29
Total non-service benefit | (39) | (37) | (23)
Total expense | 1 | 1 | 7
SCE |  |  |
Non-service cost (benefit) |  |  |
Total non-service benefit | (123) | (102) | (70)
SCE | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 127 | 119 | 111
Non-service cost (benefit) |  |  |
Interest cost | 95 | 114 | 143
Expected return on plan assets | (211) | (203) | (194)
Amortization of prior service cost | 1 | 1 | 2
Amortization of net (gain) loss | 7 | 7 | 5
Regulatory adjustment | 25 | 16 | (3)
Total non-service benefit | (83) | (65) | (47)
Total expense recognized | 44 | 54 | 64
SCE | Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Service cost | 40 | 37 | 30
Non-service cost (benefit) |  |  |
Interest cost | 52 | 63 | 77
Expected return on plan assets | (106) | (119) | (111)
Amortization of prior service cost | (1) | (1) | (1)
Amortization of net (gain) loss | (36) | (29) | (17)
Regulatory adjustment | 51 | 49 | 29
Total non-service benefit | $ (40) | $ (37) | (23)
Total expense |  |  | $ 7

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