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Income Taxes (Textual) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Tax Disclosure [Line Items] |  |  |  |
Amount of unrecognized tax benefits expected to decrease by the end of the year | $ 123 |  | $ 123 |
Disallowance of Repair Allowance Deduction |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal tax liability | 8 | $ 24 | 15 | $ 49
Tax Years 2010 to 2012 | IRS Examination | Disallowance of Repair Allowance Deduction |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal tax liability | 94 |  |  |
Amount of unrecognized tax benefits expected to decrease by the end of the year | 99 |  | 99 |
Southern California Edison |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Revisions to taxes | 18 |  |  |
Southern California Edison | Tax Years 2007 to 2009 | IRS Examination | Disallowance of Repair Allowance Deduction |  |  |  |
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 |  |  | 79 |
Federal tax liability |  |  | $ 16 |
Southern California Edison | Tax Years 2010 to 2012 | IRS Examination | Disallowance of Repair Allowance Deduction |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal tax liability | $ 100 |  |  |

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- Definition Estimated amount of loss resulting from an adverse tax position. + 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 (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + 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 (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28511-109314 + Details
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