XML 68 R51.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies (Impairment of Long-Lived Assets) (Details) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Impairment and other charges | $ 21 | $ 5 | $ 157 |
SCE |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Impairment and other charges | $ 0 | $ 0 | 163 |
San Onofre | SCE |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Impairment and other charges |  |  | 163 | $ 738
Impairment and other charges, net of tax |  |  | $ 72 | $ 437

X
- Definition Asset Impairment And Other Charges + References No definition available. + Details
Name: | eix_AssetImpairmentAndOtherCharges
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Asset Impairment Net of Tax + References No definition available. + Details
Name: | eix_AssetImpairmentNetofTax
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_JointlyOwnedUtilityPlantInterestsLineItems
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: |