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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 31 | $ 32 | $ 62 | $ 64
Non-service cost (benefit) |  |  |  |
Interest cost | 30 | 39 | 61 | 78
Expected return on plan assets | (54) | (52) | (108) | (104)
Amortization of prior service cost | 1 | 1 | 1 | 1
Amortization of net (loss) gain | 3 | 2 | 6 | 4
Regulatory adjustment | 2 | (4) | 4 | (8)
Total non-service cost (benefit) | (18) | (14) | (36) | (29)
Total expense recognized | 13 | 18 | 26 | 35
PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 9 | 8 | 18 | 16
Non-service cost (benefit) |  |  |  |
Interest cost | 17 | 21 | 34 | 42
Expected return on plan assets | (30) | (28) | (60) | (56)
Amortization of net (loss) gain | (4) | (1) | (8) | (2)
Regulatory adjustment | 8 | 6 | 16 | 12
Total non-service cost (benefit) | (9) | (2) | (18) | (4)
Total expense | 0 | 6 | 0 | 12
Southern California Edison |  |  |  |
Non-service cost (benefit) |  |  |  |
Total non-service cost (benefit) | (27) | (16) | (55) | (35)
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 30 | 31 | 60 | 62
Non-service cost (benefit) |  |  |  |
Interest cost | 28 | 36 | 56 | 71
Expected return on plan assets | (51) | (49) | (102) | (98)
Amortization of prior service cost | 1 | 1 | 1 | 1
Amortization of net (loss) gain | 2 | 2 | 4 | 3
Regulatory adjustment | 2 | (4) | 4 | (8)
Total non-service cost (benefit) | (18) | (14) | (37) | (31)
Total expense recognized | 12 | 17 | 23 | 31
Southern California Edison | PBOP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 9 | 8 | 18 | 16
Non-service cost (benefit) |  |  |  |
Interest cost | 17 | 21 | 34 | 42
Expected return on plan assets | (30) | (28) | (60) | (56)
Amortization of net (loss) gain | (4) | (1) | (8) | (2)
Regulatory adjustment | 8 | 6 | 16 | 12
Total non-service cost (benefit) | (9) | (2) | (18) | (4)
Total expense | $ 0 | $ 6 | $ 0 | $ 12

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