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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |  |
Income tax rate | 23.20% |
Decrease in income tax percentage | 0.098 |
Tax Cuts and Jobs Act, net tax benefits | $ 11 |
Unrecognized tax benefits | 68 | $ 66
Unrecognized tax benefits that would impact the effective tax rate | 45 | 43
Unrecognized tax benefits that would impact deferred taxes | 23 | $ 23
Possible decrease in unrecognized tax benefits | $ 16 |

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