Cost Recovery Balancing Account Revenue Requirement

No definition available.

Name:	eix_CostRecoveryBalancingAccountRevenueRequirement
Namespace Prefix:	eix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (Decrease) in Annual Cost Recovery Balancing Account Revenue Requirement

+ References

No definition available.

+ Details

Name:	eix_IncreaseDecreaseinAnnualCostRecoveryBalancingAccountRevenueRequirement
Namespace Prefix:	eix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Litigation Settlement, Amount Subject to Shareholder Incentive

+ References

No definition available.

+ Details

Name:	eix_LitigationSettlementAmountSubjecttoShareholderIncentive
Namespace Prefix:	eix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Period For Rate Recovery

+ References

No definition available.

+ Details

Name:	eix_PeriodForRateRecovery
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	eix_RegulatoryAssetAbstract
Namespace Prefix:	eix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	eix_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix:	eix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory assets, energy derivative contracts, high range of expiration

+ References

No definition available.

+ Details

Name:	eix_RegulatoryAssetsEnergyDerivativeContractsHighRangeOfExpiration
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory assets, energy derivative contracts, low range of expiration

+ References

No definition available.

+ Details

Name:	eix_RegulatoryAssetsEnergyDerivativeContractsLowRangeOfExpiration
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory assets, recovery period, high range

+ References

No definition available.

+ Details

Name:	eix_RegulatoryAssetsRecoveryPeriodHighRange
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory assets, recovery period, low range

+ References

No definition available.

+ Details

Name:	eix_RegulatoryAssetsRecoveryPeriodLowRange
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	eix_RegulatoryLiabilityAbstract
Namespace Prefix:	eix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory Noncurrent Asset, Amortization Period, High End of Range

+ References

No definition available.

+ Details

Name:	eix_RegulatoryNoncurrentAssetAmortizationPeriodHighEndofRange
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory Noncurrent Asset, Amortization Period, Low End of Range

+ References

No definition available.

+ Details

Name:	eix_RegulatoryNoncurrentAssetAmortizationPeriodLowEndofRange
Namespace Prefix:	eix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the return rate earned on assets included in rate base.

+ References

No definition available.

+ Details

Name:	eix_ReturnRateEarnedOnAssetsIncludedInRateBase
Namespace Prefix:	eix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

+ Details

Name:	us-gaap_RegulatoryAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

+ Details

Name:	us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

+ Details

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

+ Details

Name:	us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ 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

+ Details

Name:	us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=eix_LegacyMetersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=eix_SanOnofreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Regulatory Assets and Liabilities (Details) (USD $)	12 Months Ended		0 Months Ended
Regulatory Assets and Liabilities (Details) (USD $)	Dec. 31, 2015	Dec. 31, 2014	Feb. 01, 2012	Dec. 31, 2013
Regulatory Assets
Regulatory Assets, Current		$ 1,254,000,000us-gaap_RegulatoryAssetsCurrent		$ 538,000,000us-gaap_RegulatoryAssetsCurrent
Regulatory Asset, Long-term		7,612,000,000us-gaap_RegulatoryAssetsNoncurrent		7,241,000,000us-gaap_RegulatoryAssetsNoncurrent
Regulatory Liabilities
Regulatory Liabilities, Current		401,000,000us-gaap_RegulatoryLiabilityCurrent		767,000,000us-gaap_RegulatoryLiabilityCurrent
Regulatory Liabilities, Long-term		5,889,000,000us-gaap_RegulatoryLiabilityNoncurrent		4,995,000,000us-gaap_RegulatoryLiabilityNoncurrent
Scenario, Forecast \| California Public Utilities Commission
Regulatory Liabilities
Cost Recovery Balancing Account Revenue Requirement	5,590,000,000
Increase (Decrease) in Annual Cost Recovery Balancing Account Revenue Requirement	437,000,000
Southern California Edison
Regulatory Assets and Liabilities
Regulatory assets, energy derivatives, low range of contract expiration (in years)		1 year
Regulatory assets, energy derivatives, high range of contract expiration (in years)		45 years
Regulatory assets related to deferred income taxes, recovery period, low range (in years)		1 year
Regulatory assets related to deferred income taxes, recovery period, high range (in years)		50 years
Low end of the range of remaining original amortization (in years)		1 year
High end of the range of remaining original amortization (in years)		35 years
Regulatory Assets
Regulatory Assets, Current		1,254,000,000		538,000,000
Regulatory Asset, Long-term		7,612,000,000		7,241,000,000
Total Regulatory Assets		8,866,000,000		7,779,000,000
Regulatory Liabilities
Regulatory Liabilities, Current		401,000,000		767,000,000
Regulatory Liabilities, Long-term		5,889,000,000		4,995,000,000
Total Regulatory Liabilities		6,290,000,000		5,762,000,000
Southern California Edison \| FERC-Approved Settlement Agreements
Regulatory Liabilities
Litigation Settlement, Amount		219,000,000
Litigation Settlement, Amount Subject to Shareholder Incentive		15,000,000
Southern California Edison \| Regulatory balancing accounts
Regulatory Assets
Regulatory Assets, Current		1,088,000,000		484,000,000
Regulatory Asset, Long-term		44,000,000		818,000,000
Southern California Edison \| Energy derivatives
Regulatory Assets
Regulatory Assets, Current		159,000,000		54,000,000
Regulatory Asset, Long-term		850,000,000		816,000,000
Southern California Edison \| Other
Regulatory Assets
Regulatory Assets, Current		7,000,000		0
Regulatory Asset, Long-term		351,000,000		402,000,000
Regulatory Liabilities
Regulatory Liabilities, Current		21,000,000		43,000,000
Regulatory Liabilities, Long-term		24,000,000		12,000,000
Southern California Edison \| Deferred income taxes, net
Regulatory Assets
Regulatory Asset, Long-term		3,405,000,000		2,957,000,000
Southern California Edison \| Pensions and other postretirement benefits
Regulatory Assets
Regulatory Asset, Long-term		1,218,000,000		369,000,000
Southern California Edison \| Unamortized investments, net
Regulatory Assets and Liabilities
Return rate earned on assets included in rate base (as a percent)		7.90%		7.90%
Regulatory Assets
Regulatory Asset, Long-term		255,000,000		332,000,000
Southern California Edison \| San Onofre
Regulatory Assets
Regulatory Asset, Long-term		1,288,000,000		1,325,000,000
Southern California Edison \| Unamortized loss on reacquired debt
Regulatory Assets
Regulatory Asset, Long-term		201,000,000		222,000,000
Southern California Edison \| Regulatory balancing accounts
Regulatory Liabilities
Regulatory Liabilities, Current		380,000,000		724,000,000
Regulatory Liabilities, Long-term		1,083,000,000		1,132,000,000
Southern California Edison \| Costs of removal
Regulatory Liabilities
Regulatory Liabilities, Long-term		2,826,000,000		2,780,000,000
Southern California Edison \| Recoveries in excess of ARO Liabilities1
Regulatory Liabilities
Regulatory Liabilities, Long-term		$ 1,956,000,000		$ 1,071,000,000
Legacy Meters \| Southern California Edison \| Unamortized investments, net
Regulatory Assets and Liabilities
Return rate earned on assets included in rate base (as a percent)		6.46%		6.46%
San Onofre \| Southern California Edison
Regulatory Assets and Liabilities
Return rate earned on assets included in rate base (as a percent)		2.62%
Period For Rate Recovery			10 years