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Income Taxes (Provision and Reform) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes |  |  |
Annual effective tax rate excluding discrete items (as a percent) |  | (15.60%) | 64.20%
Various discrete tax items |  | $ (91) | $ 57
Annual effective tax rate (as a percent) |  | (7.20%) | (3.60%)
Valuation allowance change during period | $ 91 |  |
Estimated transition taxes |  | $ 104 |
Deferred tax assets change due to 2017 Tax Act |  | $ (17) |

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