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Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax provision | $ 46 | $ 64 | $ 234 | $ 178
Percentage Change | (28.10%) |  | 31.50% |
Effective tax rate | 22.00% | 27.40% | 31.80% | 26.90%

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