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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |
Income from continuing operations before income taxes | $ 571 |  | $ 487 | $ 1,162 | $ 1,324
Provision for income tax at federal statutory rate of 35% | 200 |  | 170 | 407 | 463
Increase in income tax from: |  |  |  |  |
State tax, net of federal benefit | 20 |  | 6 | 30 | 23
Property-related | (79) |  | (79) | (296) | (207)
Change related to uncertain tax positions | (5) |  | 10 | (4) | (53)
Other | (14) |  | (25) | (24) | (31)
Total income tax (benefit) expense from continuing operations | $ 122 |  | $ 82 | $ 113 | $ 195
Effective tax rate | 21.40% |  | 16.80% | 9.70% | 14.70%
Federal statutory rate | 35.00% |  | 35.00% | 35.00% | 35.00%
Southern California Edison |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income from continuing operations before income taxes | $ 607 |  | $ 509 | $ 1,291 | $ 1,370
Provision for income tax at federal statutory rate of 35% | 212 |  | 178 | 452 | 480
Increase in income tax from: |  |  |  |  |
State tax, net of federal benefit | 25 |  | 8 | 40 | 23
Property-related | (79) |  | (79) | (296) | (207)
Change related to uncertain tax positions | (7) |  | 9 | (9) | (56)
Other | (10) |  | (24) | (25) | (33)
Total income tax (benefit) expense from continuing operations | $ 141 |  | $ 92 | $ 162 | $ 207
Effective tax rate | 23.20% |  | 18.10% | 12.50% | 15.10%
Federal statutory rate | 35.00% |  | 35.00% | 35.00% | 35.00%
Tax Years 2012 to 2014 | Internal Revenue Service (IRS) | Southern California Edison |  |  |  |  |
Increase in income tax from: |  |  |  |  |
Incremental tax benefits related to repair deductions |  | $ 79 |  |  |
Incremental tax benefits related to repair deductions, pre tax |  | $ 133 |  |  |

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