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Other Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Mar. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Mar. 31, 2013 Southern California Edison Stocks | Dec. 31, 2012 Southern California Edison Stocks | Mar. 31, 2013 Southern California Edison Municipal bonds | Dec. 31, 2012 Southern California Edison Municipal bonds | Mar. 31, 2013 Southern California Edison U.S. government and agency securities | Dec. 31, 2012 Southern California Edison U.S. government and agency securities | Mar. 31, 2013 Southern California Edison Corporate bonds | Dec. 31, 2012 Southern California Edison Corporate bonds | Mar. 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 |  | 2043 |  | 2054 |  | One-year |
Amortized Cost |  |  | $ 2,505 | $ 2,483 |  |  | $ 990 | $ 978 | $ 509 | $ 518 | $ 590 | $ 547 | $ 327 | $ 324 | $ 89 | $ 116
Fair Value | $ 4,246 | $ 4,048 | $ 4,246 | $ 4,048 | $ 3,853 | $ 3,592 | $ 2,468 | $ 2,271 | $ 631 | $ 644 | $ 646 | $ 603 | $ 408 | $ 410 | $ 93 | $ 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 Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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