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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax |  | $ 0 | $ 3 |
Other |  | 0 | 2 |
Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 46 | 40 | $ 49
Interest cost |  | 102 | 117 | 98
Expected return on plan assets |  | (116) | (108) | (114)
Special termination benefits | [1] | (1) | (3) | (11)
Amortization of prior service cost |  | (12) | (36) | (36)
Amortization of net loss |  | 3 | 6 | 24
Expense under accounting standards |  | 24 | 22 | 32
Pension Plans |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 142 | 133 |
Interest cost |  | 170 | 181 |
Other |  | 14 | 9 |
Southern California Edison |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Other |  | 0 | 2 |
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 46 | 40 | 48
Interest cost |  | 102 | 117 | 97
Expected return on plan assets |  | (116) | (108) | (114)
Special termination benefits | [1] | (1) | (3) | (11)
Amortization of prior service cost |  | (12) | (35) | (35)
Amortization of net loss |  | 2 | 5 | 24
Expense under accounting standards |  | 23 | 22 | 31
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 133 | 124 |
Interest cost |  | 150 | 159 |
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax |  | (18) | (22) |
Other |  | (8) | (4) |
Continuing Operations | Pension Plans |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 142 | 133 | 162
Interest cost |  | 170 | 181 | 170
Expected return on plan assets |  | (233) | (229) | (222)
Settlement costs | [2] | 0 | 45 | 87
Curtailment gain |  | 0 | (4) | 0
Amortization of prior service cost |  | 5 | 5 | 5
Amortization of net loss | [3] | 40 | 12 | 39
Expense under accounting standards |  | 124 | 143 | 241
Regulatory adjustment (deferred) |  | (6) | 8 | (53)
Total expense recognized |  | 118 | 151 | 188
Continuing Operations | Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  | 139 | 128 | 159
Interest cost |  | 155 | 164 | 167
Expected return on plan assets |  | (217) | (213) | (222)
Settlement costs | [2] | 0 | 42 | 85
Curtailment gain |  | 0 | 0 | 0
Amortization of prior service cost |  | 5 | 5 | 5
Amortization of net loss | [3] | 35 | 7 | 35
Expense under accounting standards |  | 117 | 133 | 229
Regulatory adjustment (deferred) |  | (6) | 8 | (53)
Total expense recognized |  | $ 111 | $ 141 | $ 176
[1] | Due to the reduction in workforce, SCE has incurred costs for extended retiree health care coverage.
[2] | Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International was zero for the year ended December 31, 2015 and $3 million for the year ended December 31, 2014.
[3] | Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $14 million and $8 million, respectively, for the year ended December 31, 2015. The amount reclassified for Edison International and SCE was $9 million and $4 million, respectively, for the year ended December 31, 2014.

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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=58740216&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=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 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)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + 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=58740216&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=58740216&loc=d3e1928-114920 + Details
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