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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 |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Dec. 31, 2010 Southern California Edison | Dec. 31, 2013 Southern California Edison Stocks | Dec. 31, 2012 Southern California Edison Stocks | Dec. 31, 2013 Southern California Edison Municipal bonds | Dec. 31, 2012 Southern California Edison Municipal bonds | Dec. 31, 2013 Southern California Edison U.S. government and agency securities | Dec. 31, 2012 Southern California Edison U.S. government and agency securities | Dec. 31, 2013 Southern California Edison Corporate bonds | Dec. 31, 2012 Southern California Edison Corporate bonds | Dec. 31, 2013 Southern California Edison Short-term investments and receivables/payables | Dec. 31, 2012 Southern California Edison Short-term investments and receivables/payables
Nuclear Decommissioning Trusts Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Longest Maturity Dates (in years) |  |  |  |  |  |  | 0 |  | 2051 |  | 2044 |  | 2054 |  | One-year |
Amortized Cost |  |  | $ 2,770 | $ 2,483 |  |  | $ 656 | $ 978 | $ 675 | $ 518 | $ 902 | $ 547 | $ 208 | $ 324 | $ 329 | $ 116
Fair Value | $ 4,494 | $ 4,048 | $ 4,494 | $ 4,048 | $ 3,592 | $ 3,480 | $ 2,208 | $ 2,271 | $ 756 | $ 644 | $ 947 | $ 603 | $ 241 | $ 410 | $ 342 | $ 120

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