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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 32 | $ 32 | $ 64 | $ 64
Non-service cost (benefit) |  |  |  |
Interest cost | 39 | 35 | 78 | 70
Expected return on plan assets | (52) | (56) | (104) | (113)
Amortization of prior service cost | 1 | 0 | 1 | 1
Amortization of net (loss) gain | 2 | 2 | 4 | 4
Regulatory adjustment | (4) | 3 | (8) | 5
Total non-service cost (benefit) | (14) | (16) | (29) | (33)
Total expense recognized | 18 | 16 | 35 | 31
Net loss reclassified | 2 | 2 | 4 | 4
PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 10 | 16 | 19
Non-service cost (benefit) |  |  |  |
Interest cost | 21 | 21 | 42 | 42
Expected return on plan assets | (28) | (30) | (56) | (60)
Amortization of prior service cost | 0 | (1) | 0 | (1)
Amortization of net (loss) gain | (1) | 0 | (2) | 0
Regulatory adjustment | 6 | 0 | 12 | 0
Total non-service cost (benefit) | (2) | (10) | (4) | (19)
Total expense | 6 | 0 | 12 | 0
Southern California Edison |  |  |  |
Non-service cost (benefit) |  |  |  |
Total non-service cost (benefit) | (16) | (27) | (35) | (53)
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 31 | 31 | 62 | 62
Non-service cost (benefit) |  |  |  |
Interest cost | 36 | 32 | 71 | 64
Expected return on plan assets | (49) | (54) | (98) | (107)
Amortization of prior service cost | 1 | 0 | 1 | 1
Amortization of net (loss) gain | 2 | 2 | 3 | 3
Regulatory adjustment | (4) | 3 | (8) | 5
Total non-service cost (benefit) | (14) | (17) | (31) | (34)
Total expense recognized | 17 | 14 | 31 | 28
Net loss reclassified | 2 | 2 | 3 | 3
Southern California Edison | PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 10 | 16 | 19
Non-service cost (benefit) |  |  |  |
Interest cost | 21 | 21 | 42 | 42
Expected return on plan assets | (28) | (30) | (56) | (60)
Amortization of prior service cost | 0 | (1) | 0 | (1)
Amortization of net (loss) gain | (1) | 0 | (2) | 0
Regulatory adjustment | 6 | 0 | 12 | 0
Total non-service cost (benefit) | (2) | (10) | (4) | (19)
Total expense | $ 6 | $ 0 | $ 12 | $ 0

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