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Compensation and Benefit Plans (Expense Components) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Aug. 31, 2014 | Dec. 31, 2013
Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | $ (1) |  | $ 0 |  | $ 1 |  | $ 0 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) |  |  |  |  | 158 |  |  |  |  |
Defined Benefit Plan, Funded Status of Plan |  |  |  |  |  |  |  |  | 559 | 478
Postretirement Benefits Other Than Pensions |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Service cost | 10 |  | 14 |  | 32 |  | 42 |  |  |
Interest cost | 28 |  | 26 |  | 82 |  | 78 |  |  |
Expected return on plan assets | (28) |  | (30) |  | (84) |  | (90) |  |  |
Special Termination Benefits | 0 | [1] | 0 | [1] | 0 | [1] | 10 | [1] |  |
Amortization of prior service cost | (9) |  | (9) |  | (27) |  | (27) |  |  |
Amortization of net loss | 0 |  | 7 |  | 0 |  | 21 |  |  |
Expense under accounting standards | 1 |  | 8 |  | 3 |  | 34 |  |  |
Pension Plans |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | 2 |  | 0 |  | 2 |  | 2 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Service cost | 30 |  | 38 |  | 89 |  | 114 |  |  |
Interest cost | 48 |  | 42 |  | 141 |  | 126 |  |  |
Expected return on plan assets | (61) |  | (58) |  | (178) |  | (172) |  |  |
Settlement costs | 35 | [2] | 24 | [2] | 35 | [2] | 73 | [2] |  |
Amortization of prior service cost | 1 |  | 1 |  | 4 |  | 3 |  |  |
Amortization of net loss | 1 | [3] | 15 | [3] | 3 | [3] | 45 | [3] |  |
Expense under accounting standards | 54 |  | 62 |  | 94 |  | 189 |  |  |
Regulatory adjustment | (2) |  | (7) |  | 59 |  | (21) |  |  |
Total expense recognized | 52 |  | 55 |  | 153 |  | 168 |  |  |
Net loss reclassified | 2 |  | 4 |  | 5 |  | 11 |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate (percent) |  |  |  |  |  |  |  |  | 4.00% | 4.75%
Southern California Edison |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | (1) |  | 0 |  | 1 |  | 0 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) |  |  |  |  | 146 |  |  |  |  |
Defined Benefit Plan, Funded Status of Plan |  |  |  |  |  |  |  |  | 518 | 449
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Service cost | 10 |  | 14 |  | 32 |  | 41 |  |  |
Interest cost | 27 |  | 26 |  | 81 |  | 78 |  |  |
Expected return on plan assets | (28) |  | (30) |  | (84) |  | (90) |  |  |
Special Termination Benefits | 0 | [1] | 0 | [1] | 0 | [1] | 10 | [1] |  |
Amortization of prior service cost | (9) |  | (9) |  | (27) |  | (27) |  |  |
Amortization of net loss | 0 |  | 7 |  | 0 |  | 21 |  |  |
Expense under accounting standards | 0 |  | 8 |  | 2 |  | 33 |  |  |
Southern California Edison | Pension Plans |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |
Service cost | 29 |  | 37 |  | 87 |  | 111 |  |  |
Interest cost | 44 |  | 41 |  | 132 |  | 123 |  |  |
Expected return on plan assets | (56) |  | (57) |  | (168) |  | (171) |  |  |
Settlement costs | 33 | [2] | 24 | [2] | 33 | [2] | 72 | [2] |  |
Amortization of prior service cost | 1 |  | 1 |  | 3 |  | 3 |  |  |
Amortization of net loss | 0 | [3] | 14 | [3] | 1 | [3] | 42 | [3] |  |
Expense under accounting standards | 51 |  | 60 |  | 88 |  | 180 |  |  |
Regulatory adjustment | (2) |  | (7) |  | 59 |  | (21) |  |  |
Total expense recognized | 49 |  | 53 |  | 147 |  | 159 |  |  |
Net loss reclassified | $ 1 |  | $ 3 |  | $ 3 |  | $ 8 |  |  |
[1] | Due to the reduction in workforce, SCE has incurred costs for extended retiree health care coverage.
[2] | Relates to lump-sum payments made to employees who retired from the SCE Retirement Plan (primarily due to workforce reductions described below). Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International was $2 million for the three and nine months ended September 30, 2014 and zero and $2 million for the three and nine months ended September 30, 2013, respectively.
[3] | Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $2 million and $1 million, respectively, for the three months ended September 30, 2014, and $5 million and $3 million, respectively, for the nine months ended September 30, 2014. The amount reclassified for Edison International and SCE was $4 million and $3 million, respectively, for the three months ended September 30, 2013, and $11 million and $8 million, respectively, for the nine months ended September 30, 2013.

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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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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=28361610&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=28361610&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + 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 -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: 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=28361610&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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 (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 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=28361610&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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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 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=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Termination Benefits -URI http://asc.fasb.org/extlink&oid=6526498 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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