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Investments (Summary of Changes in Fair Value of the Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Summary Of Changes In The Fair Value [Roll Forward] |  |
Balance at beginning of period | $ 4,242 |
Balance at end of period | 4,352 |
Southern California Edison |  |
Summary Of Changes In The Fair Value [Roll Forward] |  |
Balance at beginning of period | 4,242 | $ 4,331
Gross realized gains | 99 | 17
Gross realized losses | (16) | (3)
Unrealized gains, net of losses | 27 | 59
Other-than-temporary impairments | (1) | (7)
Interest and dividends | 28 | 29
Income taxes | 0 | (18)
Decommissioning disbursements | (26) | (116)
Administrative expenses and other | (1) | (2)
Balance at end of period | $ 4,352 | $ 4,290

X
- Definition Decommissioning Trust Administrative Expenses and Other + References No definition available. + Details
Name: | eix_DecommissioningTrustAdministrativeExpensesandOther
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Decommissioning Trust Costs + References No definition available. + Details
Name: | eix_DecommissioningTrustCosts
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Decommissioning Trust Income Taxes + References No definition available. + Details
Name: | eix_DecommissioningTrustIncomeTaxes
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Discloses the amount of interest, dividend, contribution and other receipts during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustInterestDividendsContributionsAndOther
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Discloses the amount of other than temporary decline in value that has been recognized by the decommissioning trust during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustOtherThanTemporaryImpairments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents the amount of realized gain on investments in trust during the period from the sale of securities. + References No definition available. + Details
Name: | eix_DecommissioningTrustRealizedGainOnInvestments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This item represents the amount of realized loss on investments in trust during the period from the sale of securities. + References No definition available. + Details
Name: | eix_DecommissioningTrustRealizedLossOnInvestments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents the amount of net unrealized gain on investments in trust during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustUnrealizedGainsOnInvestmentsNet
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | eix_SummaryOfChangesInFairValueRollForward
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_DecommissioningTrustAssetsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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