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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension Plans |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | $ 36 | $ 39 | $ 72 | $ 78
Interest cost | 41 | 44 | 82 | 88
Expected return on plan assets | (53) | (56) | (106) | (112)
Settlement costs | 8 | 0 | 8 | 0
Amortization of prior service cost | 1 | 1 | 2 | 2
Amortization of net loss | 5 | 9 | 10 | 18
Expense under accounting standards | 38 | 37 | 68 | 74
Regulatory adjustment | (3) | (9) | (6) | (18)
Total expense recognized | 35 | 28 | 62 | 56
Net loss reclassified | 2 | 3 | 5 | 6
PBOP Plan |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 9 | 10 | 18 | 20
Interest cost | 24 | 26 | 48 | 52
Expected return on plan assets | (27) | (28) | (54) | (56)
Amortization of prior service cost | (1) | (1) | (2) | (2)
Expense under accounting standards | 5 | 7 | 10 | 14
Southern California Edison | Pension Plans |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 35 | 38 | 70 | 76
Interest cost | 37 | 41 | 74 | 82
Expected return on plan assets | (50) | (53) | (100) | (106)
Amortization of prior service cost | 1 | 1 | 2 | 2
Amortization of net loss | 4 | 8 | 8 | 16
Expense under accounting standards | 27 | 35 | 54 | 70
Regulatory adjustment | (3) | (9) | (6) | (18)
Total expense recognized | 24 | 26 | 48 | 52
Net loss reclassified | 1 | 1 | 3 | 3
Southern California Edison | PBOP Plan |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 9 | 10 | 18 | 20
Interest cost | 24 | 26 | 48 | 52
Expected return on plan assets | (27) | (28) | (54) | (56)
Amortization of prior service cost | (1) | (1) | (2) | (2)
Expense under accounting standards | $ 5 | $ 7 | $ 10 | $ 14

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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