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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) assessment | Sep. 30, 2016 | Sep. 30, 2017 USD ($) assessment | Sep. 30, 2016
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 13.30% | 28.30% | 24.00% | 27.70%
Brazilian Federal Revenue Service [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of separate tax assessments | assessment | 3 |  | 3 |
Income tax assessment | $ 490 |  | $ 490 |
Argentine Tax Authorities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | 128 |  | 128 |
Estimated Additional Tax Assessment | 213 |  | 213 |
Tax and Customs Administration, Netherlands [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | $ 106 |  | $ 106 |

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