XML 125 R108.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Regulatory Assets and Liabilities (Textual) (Details) - SCE |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2012 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory Assets [Line Items] |  |  |
Regulatory assets, energy derivatives, low range of contract expiration (in years) |  | 10 years |
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) |  | 60 years |
Low end of the range of remaining original amortization (in years) |  | 10 years |
High end of the range of remaining original amortization (in years) |  | 35 years |
San Onofre |  |  |
Regulatory Assets [Line Items] |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 2.62% | 2.62%
Period for rate recovery | 10 years |  |
Unamortized investments, net |  |  |
Regulatory Assets [Line Items] |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 7.90% | 7.90%
Unamortized investments, net | Legacy Meters |  |  |
Regulatory Assets [Line Items] |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 6.46% | 6.46%

X
- Definition Period For Rate Recovery1 + References No definition available. + Details
Name: | eix_PeriodForRateRecovery1
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=eix_GenerationInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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