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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 32 | $ 32
Non-service cost |  |
Interest cost | 39 | 35
Expected return on plan assets | (52) | (57)
Amortization of prior service cost | 0 | 1
Amortization of net loss | 2 | 2
Regulatory adjustment (deferred) | (4) | 2
Total non-service benefit2 | (15) | (17)
Total expense recognized | 17 | 15
Net loss reclassified | 2 | 2
PBOP Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 8 | 9
Non-service cost |  |
Interest cost | 21 | 21
Expected return on plan assets | (28) | (30)
Amortization of net loss | (1) | 0
Regulatory adjustment (deferred) | 6 | 0
Total non-service benefit2 | (2) | (9)
Total expense | 6 | 0
Southern California Edison |  |
Non-service cost |  |
Total non-service benefit2 | (19) | (26)
Southern California Edison | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 31 | 31
Non-service cost |  |
Interest cost | 35 | 32
Expected return on plan assets | (49) | (53)
Amortization of prior service cost | 0 | 1
Amortization of net loss | 1 | 1
Regulatory adjustment (deferred) | (4) | 2
Total non-service benefit2 | (17) | (17)
Total expense recognized | 14 | 14
Net loss reclassified | 1 | 1
Southern California Edison | PBOP Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 8 | 9
Non-service cost |  |
Interest cost | 21 | 21
Expected return on plan assets | (28) | (30)
Amortization of net loss | (1) | 0
Regulatory adjustment (deferred) | 6 | 0
Total non-service benefit2 | (2) | (9)
Total expense | $ 6 | $ 0

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