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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 31 | $ 32
Non-service cost (benefit) |  |
Interest cost | 31 | 39
Expected return on plan assets | (54) | (52)
Amortization of net (loss) gain | 3 | 2
Regulatory adjustment | 2 | (4)
Total non-service cost (benefit) | (18) | (15)
Total expense recognized | 13 | 17
Net loss reclassified | 3 | 2
PBOP Plan |  |
Non-service cost (benefit) |  |
Total non-service cost (benefit) | (9) | (2)
Total expense | 0 | 6
Southern California Edison |  |
Non-service cost (benefit) |  |
Total non-service cost (benefit) | (28) | (19)
Southern California Edison | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 30 | 31
Non-service cost (benefit) |  |
Interest cost | 28 | 35
Expected return on plan assets | (51) | (49)
Amortization of net (loss) gain | 2 | 1
Regulatory adjustment | 2 | (4)
Total non-service cost (benefit) | (19) | (17)
Total expense recognized | 11 | 14
Net loss reclassified | 2 | 1
Southern California Edison | PBOP Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 9 | 8
Non-service cost (benefit) |  |
Interest cost | 17 | 21
Expected return on plan assets | (30) | (28)
Amortization of net (loss) gain | (4) | (1)
Regulatory adjustment | 8 | 6
Total non-service cost (benefit) | (9) | (2)
Total expense | $ 0 | $ 6

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