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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Pension Plans |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | $ 39 | $ 35 | $ 117 | $ 105
Interest cost | 44 | 41 | 132 | 124
Expected return on plan assets | (56) | (57) | (168) | (171)
Amortization of prior service cost | 1 | 1 | 3 | 3
Amortization of net loss | 9 | 9 | 27 | 27
Expense under accounting standards | 37 | 29 | 111 | 88
Regulatory adjustment | (9) | (2) | (27) | (4)
Total expense recognized | 28 | 27 | 84 | 84
Net loss reclassified | 3 | 4 | 9 | 11
Postretirement Benefits Other Than Pensions |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 10 | 12 | 30 | 36
Interest cost | 26 | 29 | 78 | 86
Expected return on plan assets | (28) | (28) | (84) | (85)
Amortization of prior service cost | (1) | (3) | (3) | (9)
Amortization of net loss | 0 | 5 | 0 | 17
Expense under accounting standards | 7 | 15 | 21 | 45
Southern California Edison | Pension Plans |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 38 | 35 | 114 | 104
Interest cost | 41 | 38 | 123 | 113
Expected return on plan assets | (53) | (53) | (159) | (160)
Amortization of prior service cost | 1 | 1 | 3 | 4
Amortization of net loss | 8 | 7 | 24 | 22
Expense under accounting standards | 35 | 28 | 105 | 83
Regulatory adjustment | (9) | (2) | (27) | (4)
Total expense recognized | 26 | 26 | 78 | 79
Net loss reclassified | 2 | 2 | 5 | 6
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |
Service cost | 10 | 12 | 30 | 36
Interest cost | 26 | 28 | 78 | 84
Expected return on plan assets | (28) | (28) | (84) | (84)
Amortization of prior service cost | (1) | (3) | (3) | (9)
Amortization of net loss | 0 | 6 | 0 | 17
Expense under accounting standards | $ 7 | $ 15 | $ 21 | $ 44

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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