XML 73 R57.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Investments (Textual) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Investments [Line Items] |  |
Unrealized holding gains, net of losses | $ 1,500 | $ 1,400
Deferred income taxes related to unrealized gains | 357 |
Nuclear decommissioning trusts | $ 3,900 |

X
- Definition Decommissioning Fund Investments, Fair Value, Net of Deferred Income Tax + References No definition available. + Details
Name: | eix_DecommissioningFundInvestmentsFairValueNetofDeferredIncomeTax
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Decommissioning Trust, Deferred Income Taxes + References No definition available. + Details
Name: | eix_DecommissioningTrustDeferredIncomeTaxes
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_InvestmentHoldingsLineItems
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: |