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Income Taxes (Interest and Penalties Related to Income Taxes) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Disclosure [Line Items] |  |  |
Accrued interest and penalties | $ 278 | $ 242 |
Net after-tax interest and penalties tax benefit (expense) | (10) | (8) | 166
Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Accrued interest and penalties | 87 | 75 |
Net after-tax interest and penalties tax benefit (expense) | $ (11) | $ (8) | $ 80

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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