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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Income tax rate | 26.10% |
Increase in income tax percentage | 0.029 |
Tax benefits related to prior audit years |  | $ 22
Tax benefits related to the 2017 Tax Cuts and Jobs Act |  | 20
Tax expense related to valuation allowance on foreign tax credit carryforwards | $ 11 |
Tax benefits related to effective settlement of IRS audit | 11 |
Unrecognized tax benefits | 55 | 85
Unrecognized tax benefits that would impact the effective tax rate | 45 | 59
Unrecognized tax benefits that would impact deferred taxes | 10 | $ 26
Possible decrease in unrecognized tax benefits | $ 14 |

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