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Summary of Significant Accounting Policies (Details) (USD $) | 1 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2012 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Dec. 31, 2010 Southern California Edison | Dec. 31, 2012 Edison International | Dec. 31, 2012 Edison Mission Energy | Dec. 31, 2012 Edison Mission Energy Edison International | Dec. 31, 2012 Electric Utility Southern California Edison sqmi
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of days after bankruptcy filing for settlement transaction (days) |  |  |  |  |  | 150 days |  |
Impairment and other charges, after tax |  |  |  |  |  |  | $ 1,258,000,000 |
Supply of electricity, area covered (square mile) |  |  |  |  |  |  |  | 50,000
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |
Base rate revenue requirement authorized by CPUC | 5,700,000,000 |  |  |  |  |  |  |
Increase in base rate revenue requirement authorized By CPUC |  | 470,000,000 |  |  |  |  |  |
Revenue collected in excess of recognized revenues |  | 106,000,000 |  |  |  |  |  |
Revenue received as agent |  | 44,000,000 | 1,100,000,000 | 1,200,000,000 |  |  |  |
Sales and Use Taxes [Abstract] |  |  |  |  |  |  |  |
Franchise fees billed to customers |  | 98,000,000 | 101,000,000 | 102,000,000 |  |  |  |
Dividend Restrictions [Abstract] |  |  |  |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  |  |  | 48.00% |  |  |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) |  | 13 months |  |  |  |  |  |
Period for calculation of weighted average common equity component (months) |  | 13 months |  |  |  |  |  |
Weighted-average common equity component of total capitalization (as a percent) |  | 48.60% |  |  |  |  |  |
Restriction on net assets |  | 11,600,000,000 |  |  |  |  |  |
Capacity to pay additional dividends |  | $ 125,000,000 |  |  |  |  |  |

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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 7, 8 -Chapter 3 -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 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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