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Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | $ 399 |  |
Operating loss carryforwards | 1,900 |  |
Deferred tax assets, loss and credit carryforwards | 2,228 | 1,515 |
Earnings benefit from change in prior year tax deductions | 231 |  |
Unrecognized tax benefits that would impact the effective tax rate | 653 | 622 |
Federal statutory income tax rate (percent) | 35.00% | 35.00% | 35.00%
Tax Credit Carryforward, expire between 2029 - 2033 |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 376 |  |
Net Operating Loss, expire between 2015 - 2025 |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 36 |  |
Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 55 |  |
Operating loss carryforwards | 371 |  |
Deferred tax assets, loss and credit carryforwards | 427 | 125 |
Unrecognized tax benefits that would impact the effective tax rate | 374 | 388 |
Southern California Edison | Tax Credit Carryforward, expire between 2030 - 2033 |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | 41 |  |
Southern California Edison | Net Operating Loss, expire between 2015 -2017 |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 18 |  |
Edison Mission Energy |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, loss and credit carryforwards | 1,600 |  |
Deferred Tax Assets No Longer Available Due to Deconsolidation | 220 |  |
Tax basis in stock | 544 |  |
Tax Years 2003 to 2006 [Member] | Proposed Adjustment to Taxable Gain [Member] | Southern California Edison | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | 206 |  |
Tax Years 2003 to 2006 [Member] | Disallowance of Repair Allowance Deduction [Member] | Southern California Edison | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | 100 |  |
Tax Years 2007 to 2009 [Member] | Disallowance of Repair Allowance Deduction [Member] | Southern California Edison | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | $ 74 |  |

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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 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: 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 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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