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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 assessment | Sep. 30, 2015 | Sep. 30, 2016 USD ($) assessment | Sep. 30, 2015
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 28.30% | 31.10% | 27.70% | 28.70%
Tax years 2004, 2006. and 2007 [Member] | Brazilian Federal Revenue Service [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of separate tax assessments | assessment | 3 |  | 3 |
Income Tax Examination, Estimate of Possible Loss |  |  | $ 455 |
Tax years 2004 to 2008 [Member] | Argentine Tax Authorities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  |  | 113 |
Tax years after 2008 [Member] | Argentine Tax Authorities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  |  | 159 |
Tax Year 2009 [Member] | Tax and Customs Administration, Netherlands [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  |  | $ 100 |

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