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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosures [Line Items] |  |
Income from continuing operations before income taxes | $ 211 | $ 352
Provision for income tax at federal statutory rate of 21% and 35%, respectively 1 | 44 | 124
Increase in income tax from: |  |
State tax, net of federal benefit | (5) | 10
Property-related | (69) | (113)
Change related to uncertain tax positions | 0 | (12)
Shared-based compensation | 0 | (43)
Other | (1) | (6)
Total income tax (benefit) expense from continuing operations | $ (31) | $ (40)
Effective tax rate | (14.70%) | (11.40%)
State |  |
Increase in income tax from: |  |
Shared-based compensation |  | $ 6
Southern California Edison |  |
Income Tax Disclosures [Line Items] |  |
Income from continuing operations before income taxes | $ 310 | 392
Provision for income tax at federal statutory rate of 21% and 35%, respectively 1 | 65 | 137
Increase in income tax from: |  |
State tax, net of federal benefit | 1 | 13
Property-related | (69) | (113)
Change related to uncertain tax positions | (1) | (11)
Shared-based compensation | 0 | (8)
Other | (2) | (6)
Total income tax (benefit) expense from continuing operations | $ (6) | $ 12
Effective tax rate | (1.90%) | 3.10%
Southern California Edison | State |  |
Increase in income tax from: |  |
Shared-based compensation |  | $ 1

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