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Compensation and Benefit Plans (Unrecognized Compensation Costs) (Details) (Employee Stock Option, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Pension and Other Postretirement Benefits |
Unrecognized compensation cost, net of expected forfeitures | $ 13 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighed-average period (in years) | 2 years 3 months 18 days
Southern California Edison |
Pension and Other Postretirement Benefits |
Unrecognized compensation cost, net of expected forfeitures | $ 9 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Weighed-average period (in years) | 2 years 4 months 24 days

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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