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Other Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Fair Value | $ 4,799 us-gaap_DecommissioningTrustAssetsAmount | $ 4,494 us-gaap_DecommissioningTrustAssetsAmount |  |
Southern California Edison |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Amortized Cost | 3,020 eix_DecommissioningTrustAssetsAmortizedCost / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,770 eix_DecommissioningTrustAssetsAmortizedCost / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | 4,799 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 4,494 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 4,048 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 3,592 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Stocks |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Longest Maturity Dates (in years) | 0 |  |  |
Amortized Cost | 524 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_EquitySecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 656 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_EquitySecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | 2,031 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_EquitySecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,208 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_EquitySecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | Municipal bonds |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Longest Maturity Dates (in years) | 2054 |  |  |
Amortized Cost | 681 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_MunicipalBondsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 675 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_MunicipalBondsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | 822 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_MunicipalBondsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 756 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_MunicipalBondsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | U.S. government and agency securities |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Longest Maturity Dates (in years) | 2045 |  |  |
Amortized Cost | 777 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_USGovernmentDebtSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 902 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_USGovernmentDebtSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | 836 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_USGovernmentDebtSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 947 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_USGovernmentDebtSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | Corporate bonds |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Longest Maturity Dates (in years) | 2057 |  |  |
Amortized Cost | 346 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 208 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | 395 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 241 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | Short-term investments and receivables/payables |  |  |  |
Nuclear Decommissioning Trusts Disclosures |  |  |  |
Longest Maturity Dates (in years) | One-year |  |  |
Amortized Cost | 692 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_ShortTermInvestmentsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 329 eix_DecommissioningTrustAssetsAmortizedCost / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_ShortTermInvestmentsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value | $ 715 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_ShortTermInvestmentsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 342 us-gaap_DecommissioningTrustAssetsAmount / eix_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAssetTypeAxis = us-gaap_ShortTermInvestmentsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |

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- Definition The amount of decommissioning trust assets at amortized cost as of the balance sheet date. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The maturity dates for decommissioning trust investments. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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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
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- Details
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