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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Non-service cost |  |  |  |
Total non-service cost |  | $ 1 |  | $ (7)
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 32 | 36 | $ 64 | 72
Non-service cost |  |  |  |
Interest cost | 35 | 41 | 70 | 82
Expected return on plan assets | (56) | (53) | (113) | (106)
Settlement costs | 0 | 8 | 0 | 8
Amortization of prior service cost | 0 | 1 | 1 | 2
Amortization of net loss | 2 | 5 | 4 | 10
Regulatory adjustment (deferred) | 3 | (3) | 5 | (6)
Total non-service cost | (16) | (1) | (33) | (10)
Total expense recognized | 16 | 35 | 31 | 62
Settlement costs after tax |  | 5 |  |
Net loss reclassified | 2 | 2 | 4 | 5
PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 10 | 9 | 19 | 18
Non-service cost |  |  |  |
Interest cost | 21 | 24 | 42 | 48
Expected return on plan assets | (30) | (27) | (60) | (54)
Amortization of prior service cost | (1) | (1) | (1) | (2)
Total non-service cost | (10) | (4) | (19) | (8)
Total expense | 0 | 5 | 0 | 10
Southern California Edison |  |  |  |
Non-service cost |  |  |  |
Total non-service cost | (27) | (9) | (53) | (18)
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 31 | 35 | 62 | 70
Non-service cost |  |  |  |
Interest cost | 32 | 37 | 64 | 74
Expected return on plan assets | (54) | (50) | (107) | (100)
Amortization of prior service cost | 0 | 1 | 1 | 2
Amortization of net loss | 2 | 4 | 3 | 8
Regulatory adjustment (deferred) | 3 | (3) | 5 | (6)
Total non-service cost | (17) | (11) | (34) | (22)
Total expense recognized | 14 | 24 | 28 | 48
Net loss reclassified | 2 | 1 | 3 | 3
Southern California Edison | PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 10 | 9 | 19 | 18
Non-service cost |  |  |  |
Interest cost | 21 | 24 | 42 | 48
Expected return on plan assets | (30) | (27) | (60) | (54)
Amortization of prior service cost | (1) | (1) | (1) | (2)
Total non-service cost | (10) | (4) | (19) | (8)
Total expense | $ 0 | $ 5 | $ 0 | $ 10

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