The actual asset allocation of fair value of publicly traded equity investments.

No definition available.

Name:	eix_DefinedBenefitPlanAssetAllocationsOfAssetsPubliclyTradedEquityInvestments
Namespace Prefix:	eix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
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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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Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
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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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Namespace Prefix:	eix_
Data Type:	num:percentItemType
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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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Period Type:	duration

- 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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Namespace Prefix:	eix_
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Period Type:	duration

- 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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Balance Type:	na
Period Type:	duration

- 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

Name:	eix_DefinedBenefitPlanTargetAllocationPercentageOfAssetsUsEquitySecurities
Namespace Prefix:	eix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	eix_
Data Type:	num:percentItemType
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Period Type:	instant

- 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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Namespace Prefix:	eix_
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Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- 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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Period Type:	duration

- 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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Data Type:	xbrli:monetaryItemType
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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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Period Type:	duration

- 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

+ Details

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Period Type:	duration

- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ 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

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- 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

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Period Type:	instant

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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-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

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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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 3

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-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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-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

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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%