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Other Investments (Textual) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Investments [Line Items] |  |  |
Proceeds from sale of securities | $ 10,079,000,000 us-gaap_ProceedsFromDecommissioningFund | $ 5,617,000,000 us-gaap_ProceedsFromDecommissioningFund | $ 2,122,000,000 us-gaap_ProceedsFromDecommissioningFund
Southern California Edison |  |  |
Other Investments [Line Items] |  |  |
Contributions received for decommissioning trusts | 5,000,000 eix_DecommissioningTrustContributionsReceived / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 22,000,000 eix_DecommissioningTrustContributionsReceived / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 23,000,000 eix_DecommissioningTrustContributionsReceived / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Period of reviewing contributions from decommissioning trusts (in years) | 3 years |  |
Proceeds from sale of securities | 10,079,000,000 us-gaap_ProceedsFromDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 5,617,000,000 us-gaap_ProceedsFromDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,122,000,000 us-gaap_ProceedsFromDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Unrealized holding gains, net of losses | 1,800,000,000 eix_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 1,700,000,000 eix_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Decommissioning Trust, Deferred Income Taxes | 441,000,000 eix_DecommissioningTrustDeferredIncomeTaxes / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Decommissioning Fund Investments, Fair Value, Net of Deferred Income Tax | $ 4,400,000,000 eix_DecommissioningFundInvestmentsFairValueNetofDeferredIncomeTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |

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- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacting investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. + References No definition available. + Details
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- Definition Decommissioning Fund Investments, Fair Value, Net of Deferred Income Tax + References No definition available. + Details
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- Definition Amount of contributions from customers into the decommissioning trusts. + References No definition available. + Details
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- Definition Decommissioning Trust, Deferred Income Taxes + References No definition available. + Details
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- Definition Period of Reviewing and Revising Contributions from Decommissioning Trusts + References No definition available. + Details
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- Details
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- Definition The cash inflow from the sale of assets held in a decommissioning trust fund. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Details
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