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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 31 | $ 32 | $ 95 | $ 96
Non-service cost (benefit) |  |  |  |
Interest cost | 38 | 35 | 116 | 105
Expected return on plan assets | (52) | (56) | (156) | (169)
Amortization of prior service cost | 0 | 1 | 1 | 2
Amortization of net (loss) gain | 2 | 2 | 6 | 6
Regulatory adjustment | (4) | 2 | (12) | 7
Total non-service cost (benefit) | (16) | (16) | (45) | (49)
Total expense recognized | 15 | 16 | 50 | 47
Net loss reclassified | 2 | 2 | 6 | 6
PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 10 | 24 | 29
Non-service cost (benefit) |  |  |  |
Interest cost | 21 | 21 | 63 | 63
Expected return on plan assets | (28) | (31) | (84) | (91)
Amortization of prior service cost | (1) | 0 | (1) | (1)
Amortization of net (loss) gain | 0 | 0 | (2) | 0
Regulatory adjustment | 5 | 0 | 17 | 0
Total non-service cost (benefit) | (3) | (10) | (7) | (29)
Total expense | 5 | 0 | 17 | 0
Southern California Edison |  |  |  |
Non-service cost (benefit) |  |  |  |
Total non-service cost (benefit) | (19) | (26) | (54) | (79)
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 31 | 31 | 93 | 93
Non-service cost (benefit) |  |  |  |
Interest cost | 35 | 32 | 106 | 96
Expected return on plan assets | (48) | (52) | (146) | (159)
Amortization of prior service cost | 0 | 1 | 1 | 2
Amortization of net (loss) gain | 1 | 1 | 4 | 4
Regulatory adjustment | (4) | 2 | (12) | 7
Total non-service cost (benefit) | (16) | (16) | (47) | (50)
Total expense recognized | 15 | 15 | 46 | 43
Net loss reclassified | 2 | 1 | 5 | 4
Southern California Edison | PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 10 | 24 | 29
Non-service cost (benefit) |  |  |  |
Interest cost | 21 | 21 | 63 | 63
Expected return on plan assets | (28) | (31) | (83) | (91)
Amortization of prior service cost | (1) | 0 | (1) | (1)
Amortization of net (loss) gain | 0 | 0 | (2) | 0
Regulatory adjustment | 5 | 0 | 17 | 0
Total non-service cost (benefit) | (3) | (10) | (6) | (29)
Total expense | $ 5 | $ 0 | $ 18 | $ 0

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