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Compensation and Benefit Plans (Pension and Postretirement Benefits Textual) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2013 | May 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Retirement liabilities for EME employees | $ 1,378 | $ 2,614 |  |
Net gain (loss) recognized on other comprehensive income | 2 |  |  |
Amortization of prior service credit | 11 |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 563 |  |  |
Funded status at end of year | 478 | 1,110 |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Percentage of premium included in estimated rate of return of equity securities | 5.00% |  |  |
Percentage of premium included in estimated rate of return of public equity and hedge funds | 2.00% |  |  |
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year | 6 |  |  |
Estimated future employer contributions in 2014 | 200 |  |  |
Retirement liabilities for EME employees | 686 | 1,387 |  |
Amortization of prior service credit | 5 |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 330 | (370) |  |
Discount rate | 4.75% | 3.75% | 4.50% | 4.25%
Funded status at end of year | (701) | (1,406) |  |
Unrecognized net loss to be amortized | (5) |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation percentage of US equity securities |  | 30.00% |  |
Defined Benefit Plan, Target Allocation Percentage of Assets Non US Equity Securities |  | 16.00% |  |
Target asset allocation |  | 35.00% |  |
Permissible Range of Asset Class Portfolio Weights | 3.00% |  |  |
Asset allocations of publicly traded equity investments | 67.00% | 66.00% |  |
Defined Benefit Plan, Target Allocation, Percentage of Assets Alternative Investment |  | 15.00% |  |
Defined Benefit Plan, Target Allocation, Percentage of Assets Other Investments |  | 4.00% |  |
Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Estimated future employer contributions in 2014 | 14 |  |  |
Retirement liabilities for EME employees | 138 | 642 |  |
Amortization of prior service credit | (36) |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 313 | 86 |  |
Discount rate | 5.00% | 4.25% |  |
Funded status at end of year | (155) | (660) |  |
Retirement eligibility age | 55 years |  |  |
Minimum service period for eligibility | 10 years |  |  |
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] |  |  |  |
Effect of one percentage point increase on accumulated benefit obligation | 229 |  |  |
Effect of one percentage point decrease on accumulated benefit obligation | (191) |  |  |
Effect of one percentage point increase on aggregate service and interest costs | 11 |  |  |
Effect of one percentage point decrease on aggregate service and interest costs | (9) |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation percentage of US equity securities |  | 41.00% |  |
Defined Benefit Plan, Target Allocation Percentage of Assets Non US Equity Securities |  | 17.00% |  |
Target asset allocation |  | 34.00% |  |
Asset allocations of publicly traded equity investments | 65.00% | 66.00% |  |
Defined Benefit Plan, Target Allocation, Percentage of Assets Alternative Investment |  | 7.00% |  |
Defined Benefit Plan, Target Allocation, Percentage of Assets Other Investments |  | 1.00% |  |
Edison Mission Energy |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Retirement liabilities for EME employees | 35 | 80 |  |
Southern California Edison |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Retirement liabilities for EME employees | 951 | 2,245 |  |
Amortization of prior service credit | 7 |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 558 |  |  |
Funded status at end of year | 449 | 1,070 |  |
Southern California Edison | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year | 4 |  |  |
Estimated future employer contributions in 2014 | 173 |  |  |
Retirement liabilities for EME employees | 480 | 1,108 |  |
Amortization of prior service credit | 5 |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 277 | (318) |  |
Discount rate | 4.75% | 3.75% |  |
Funded status at end of year | (485) | (1,114) |  |
Unrecognized net loss to be amortized | (2) |  |  |
Southern California Edison | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Retirement liabilities for EME employees | 130 | 634 |  |
Amortization of prior service credit | (36) |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) | 312 | 86 |  |
Discount rate | 5.00% | 4.25% |  |
Funded status at end of year | (146) | (652) |  |
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] |  |  |  |
Effect of one percentage point increase on accumulated benefit obligation | 228 |  |  |
Effect of one percentage point decrease on accumulated benefit obligation | (190) |  |  |
Effect of one percentage point increase on aggregate service and interest costs | 11 |  |  |
Effect of one percentage point decrease on aggregate service and interest costs | $ (9) |  |  |
US Equities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 30.00% |  |  |
US Equities [Member] | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 41.00% |  |  |
Non-US Equities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 16.00% |  |  |
Non-US Equities [Member] | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 17.00% |  |  |
Fixed Income Securities [Member] | Pension Plans |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 35.00% |  |  |
Fixed Income Securities [Member] | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 34.00% |  |  |
Opportunistic Alternative Investments [Member] | Pension Plans |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 15.00% |  |  |
Opportunistic Alternative Investments [Member] | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 7.00% |  |  |
Other Investments [Member] | Pension Plans |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 4.00% |  |  |
Other Investments [Member] | Postretirement Benefits Other Than Pensions |  |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |
Target asset allocation | 1.00% |  |  |

X
- Definition The actual asset allocation of fair value of publicly traded equity investments. + References No definition available. + Details
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- Definition This element represents the employee retiring age in order to be eligible for the plan. + References No definition available. + Details
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- Definition This element represents the minimum service period required, for the employee to be eligible for the benefits. + References No definition available. + Details
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- Definition This element represents the permissible range of asset class portfolio weights. + References No definition available. + Details
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- Definition Target allocation percentage of investments in alternative investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Alternative investments include investments in private equities, hedge funds and fixed income securities. + References No definition available. + Details
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- Definition Target allocation percentage of investments in non U.S. equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. + References No definition available. + Details
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- Definition Target allocation percentage of other investments not elsewhere specifically mentioned in the taxonomy to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Alternative investments include investments in private equities, hedge funds and fixed income securities. + References No definition available. + Details
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- Definition Target allocation percentage of investments in U.S. equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. + References No definition available. + Details
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- Definition This element represents the percentage of premium included in estimated rate of return of equity securities (as a percent) + References No definition available. + Details
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- Definition This element represents the percentage of premium included in estimated rate of return of public equity and hedge funds. + References No definition available. + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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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 Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + 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 Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -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 Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -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 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 Reference 4: 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 5: 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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