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Investments (Summary of Changes in Fair Value of the Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Summary Of Changes In The Fair Value [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 4,331 |
Balance at end of period | $ 4,376 |  | 4,376 |
Southern California Edison |  |  |  |
Summary Of Changes In The Fair Value [Roll Forward] |  |  |  |
Balance at beginning of period | 4,344 | $ 4,836 | 4,331 | $ 4,799
Gross realized gains | 18 | 183 | 61 | 215
Gross realized losses | (1) | (10) | (5) | (15)
Unrealized gains (losses), net | 32 | (316) | 153 | (343)
Other-than-temporary impairments | (2) | (10) | (10) | (22)
Interest and dividends | 28 | 28 | 88 | 88
Contributions | 0 | 0 | 0 | 7
Income taxes | (5) | 0 | (47) | (14)
Decommissioning disbursements | (38) | (319) | (192) | (319)
Administrative expenses and other | 0 | (4) | (3) | (8)
Balance at end of period | $ 4,376 | $ 4,388 | $ 4,376 | $ 4,388

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- 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 Amount of contributions from customers into the decommissioning trusts. + References No definition available. + Details
Name: | eix_DecommissioningTrustContributionsReceived
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |