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Preferred and Preference Stock of Utility (Schedule of Preferred and Preference Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Preferred and Preference Stock of Utility |  |
Edison International's preferred and preference stock of utility | $ 2,022 us-gaap_MinorityInterestAmountRepresentedByPreferredStock | $ 1,753 us-gaap_MinorityInterestAmountRepresentedByPreferredStock
Southern California Edison |  |
Preferred and Preference Stock of Utility |  |
Edison International's preferred and preference stock of utility | 2,070 us-gaap_MinorityInterestAmountRepresentedByPreferredStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 1,795 us-gaap_MinorityInterestAmountRepresentedByPreferredStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | 4.08% Series |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 650,000 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock408PercentMember |
Redemption Price (in dollars per share) | $ 25.5 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock408PercentMember |
Preferred stock before issuance costs | 16 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock408PercentMember | 16 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock408PercentMember
Preference stock (as a percent) | 4.08%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock408PercentMember |
Southern California Edison | 4.24% Series |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 1,200,000 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock424PercentMember |
Redemption Price (in dollars per share) | $ 25.8 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock424PercentMember |
Preferred stock before issuance costs | 30 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock424PercentMember | 30 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock424PercentMember
Preference stock (as a percent) | 4.24%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock424PercentMember |
Southern California Edison | 4.32% Series |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 1,653,429 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock432PercentMember |
Redemption Price (in dollars per share) | $ 28.75 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock432PercentMember |
Preferred stock before issuance costs | 41 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock432PercentMember | 41 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock432PercentMember
Preference stock (as a percent) | 4.32%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock432PercentMember |
Southern California Edison | 4.78% Series |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 1,296,769 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock478PercentMember |
Redemption Price (in dollars per share) | $ 25.8 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock478PercentMember |
Preferred stock before issuance costs | 33 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock478PercentMember | 33 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock478PercentMember
Preference stock (as a percent) | 4.78%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_CumulativePreferredStock478PercentMember |
Southern California Edison | Preference stock |  |
Preferred and Preference Stock of Utility |  |
Preferred stock before issuance costs | 2,070 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | 1,795 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Less issuance costs | (48)eix_PreferredStockIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | (42)eix_PreferredStockIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Edison International's preferred and preference stock of utility | 2,022 us-gaap_MinorityInterestAmountRepresentedByPreferredStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | 1,753 us-gaap_MinorityInterestAmountRepresentedByPreferredStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Southern California Edison | 4.51% Series A (variable and noncumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 3,250,000 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Redemption Price (in dollars per share) | $ 100 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Preferred stock before issuance costs | 325 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 325 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Preference stock (as a percent) | 4.51%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Southern California Edison | 6.50% Series D (cumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 1,250,000 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Redemption Price (in dollars per share) | $ 100 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Preferred stock before issuance costs | 125 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 125 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Preference stock (as a percent) | 6.50%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |
Southern California Edison | 6.25% Series E (cumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 350,000 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Redemption Price (in dollars per share) | $ 1,000 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Preferred stock before issuance costs | 350 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | 350 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember
Preference stock (as a percent) | 6.25%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Southern California Edison | 5.625% Series F (cumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 190,004 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |
Redemption Price (in dollars per share) | $ 2,500 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |
Preferred stock before issuance costs | 475 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember | 475 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember
Preference stock (as a percent) | 5.625%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |
Southern California Edison | 5.10% Series G (cumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 160,004 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |
Redemption Price (in dollars per share) | $ 2,500 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |
Preferred stock before issuance costs | 400 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember | 400 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember
Preference stock (as a percent) | 5.10%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |
Southern California Edison | 5.75% Series H (cumulative) |  |
Preferred and Preference Stock of Utility |  |
Shares Outstanding | 110,004 us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember |
Redemption Price (in dollars per share) | $ 2,500 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember |
Preferred stock before issuance costs | $ 275 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember | $ 0 eix_PreferredStockBeforeIssuanceCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember
Preference stock (as a percent) | 5.75%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember |

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- Definition This element represents the value of preferred and preference stock before issuance costs. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the issuance costs related to cumulative preferred stock and preference stock. + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Definition The amount of noncontrolling interest in subsidiary represented by preferred securities issued by the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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