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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) assessment | Jun. 30, 2016 | Jun. 30, 2017 USD ($) assessment | Jun. 30, 2016
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 28.20% | 29.20% | 26.90% | 27.30%
Brazilian Federal Revenue Service [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of separate tax assessments | assessment | 3 |  | 3 |
Income tax assessment | $ 464 |  | $ 464 |
Argentine Tax Authorities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | 130 |  | 130 |
Estimated Additional Tax Assessment | 210 |  | 210 |
Tax and Customs Administration, Netherlands [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | $ 103 |  | $ 103 |

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