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Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, loss and credit carryforwards | $ 1,515 | $ 689 |
Deferred tax assets, valuation allowance | 1,017 | 0 |
Earnings benefit from change in prior year tax deductions | 231 |  |
Earnings benefit from change in tax deductions, current year earnings benefit | 115 |  |
Unrecognized tax benefits that would impact the effective tax rate | 622 | 532 |
Federal statutory income tax rate (percent) | 35.00% | 35.00% | 35.00%
IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 309 |  |
Operating loss carryforwards | 1,200 |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | 198 |  |
Penalty for understatement of tax liability (as a percent) | 40.00% |  |
Tax Credit Carryforward, expire between 2029 - 2032 | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 287 |  |
Net Operating Loss, expire between 2015 - 2024 | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 26 |  |
Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, loss and credit carryforwards | 125 | 15 |
Deferred tax assets, valuation allowance | 0 | 0 |
Unrecognized tax benefits that would impact the effective tax rate | 388 | 282 |
Southern California Edison | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 42 |  |
Operating loss carryforwards | 83 |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | 96 |  |
Southern California Edison | Tax Credit Carryforward, expire between 2030 - 2032 | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 28 |  |
Southern California Edison | Net Operating Loss, expire between 2015 -2016 | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 12 |  |
Edison Mission Energy |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax basis in stock | $ 542 |  |

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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