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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Total non-service cost |  | $ (8)
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 32 | 36
Interest cost | 35 | 41
Expected return on plan assets | (57) | (53)
Amortization of prior service cost | 1 | 1
Amortization of net loss | 2 | 5
Regulatory adjustment (deferred) | 2 | (3)
Total non-service cost | (17) | (9)
Total expense recognized | 15 | 27
Net loss reclassified | 2 | 3
PBOP Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 9 | 9
Interest cost | 21 | 24
Expected return on plan assets | (30) | (27)
Amortization of prior service cost | 0 | (1)
Total non-service cost | (9) | (4)
Total expense | 0 | 5
Southern California Edison |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total non-service cost | (26) | (9)
Southern California Edison | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 31 | 35
Interest cost | 32 | 37
Expected return on plan assets | (53) | (50)
Amortization of prior service cost | 1 | 1
Amortization of net loss | 1 | 4
Regulatory adjustment (deferred) | 2 | (3)
Total non-service cost | (17) | (11)
Total expense recognized | 14 | 24
Net loss reclassified | 1 | 2
Southern California Edison | PBOP Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 9 | 9
Interest cost | 21 | 24
Expected return on plan assets | (30) | (27)
Amortization of prior service cost | 0 | (1)
Total non-service cost | (9) | (4)
Total expense | $ 0 | $ 5

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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