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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosures [Line Items] |  |  |  |  |
Income from continuing operations before income taxes | $ 627 | $ 432 |  | $ 1,127 | $ 1,119
Provision for income tax at federal statutory rate of 21% and 35%, respectively | 132 | 151 |  | 237 | 392
Increase in income tax from: |  |  |  |  |
State tax, net of federal benefit | 26 | 7 |  | 21 | 23
Property-related | (76) | (201) |  | (214) | (396)
Change related to uncertain tax positions | 1 | 0 |  | 1 | (17)
Shared-based compensation | (1) | (4) |  | (1) | (50)
Other | 1 | (22) |  | (1) | (35)
Total income tax expense (benefit) from continuing operations | $ 83 | $ (69) |  | $ 43 | $ (83)
Effective tax rate | 13.20% | (16.00%) |  | 3.80% | (7.40%)
State |  |  |  |  |
Increase in income tax from: |  |  |  |  |
Shared-based compensation |  |  |  |  | $ 10
Southern California Edison |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |
Income from continuing operations before income taxes | $ 653 | $ 462 |  | $ 1,288 | 1,249
Provision for income tax at federal statutory rate of 21% and 35%, respectively | 137 | 162 |  | 270 | 437
Increase in income tax from: |  |  |  |  |
State tax, net of federal benefit | 29 | 12 |  | 33 | 34
Property-related | (76) | (201) |  | (214) | (396)
Change related to uncertain tax positions | (1) | (1) |  | (2) | (13)
Shared-based compensation | (1) | (1) |  | (1) | (10)
Other | (2) | (6) |  | (8) | (18)
Total income tax expense (benefit) from continuing operations | $ 86 | $ (35) |  | $ 78 | $ 34
Effective tax rate | 13.20% | (7.60%) |  | 6.10% | 2.70%
Tax abandonment loss |  |  | $ 39 |  |
Southern California Edison | Federal |  |  |  |  |
Increase in income tax from: |  |  |  |  |
Tax abandonment loss |  |  | 691 |  |
Southern California Edison | Federal | Tax accounting method changes |  |  |  |  |
Increase in income tax from: |  |  |  |  |
Incremental tax benefits related to repair deductions |  | $ 70 |  |  |
Incremental tax benefits related to repair deductions, before tax |  | $ 118 |  |  |
Southern California Edison | State |  |  |  |  |
Increase in income tax from: |  |  |  |  |
Shared-based compensation |  |  |  |  | $ 2
Tax abandonment loss |  |  | $ 1,130 |  |

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