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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) assessment | Jun. 30, 2018 | Jun. 30, 2019 USD ($) assessment | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 13.10% | 13.20% | 19.90% | 13.80%
Brazilian Federal Revenue Service [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of separate tax assessments | assessment | 3 |  | 3 |
Income tax assessment | $ 110 |  | $ 110 |
Income tax assessment - Interest and Penalties | 317 |  | 317 |
Argentine Tax Authorities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | 20 |  | 20 |
Income tax assessment - Interest and Penalties | 69 |  | 69 |
Estimated Additional Tax Assessment | 56 |  | 56 |
Additional income tax assessment - Interest and Penalties | 53 |  | 53 |
Tax and Customs Administration, Netherlands [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax assessment | 92 |  | 92 |
Additional income tax assessment - Interest and Penalties | $ 33 |  | $ 33 |

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- Definition The element represents the amount of additional income tax assessment that could be received in all tax years for which an audit has not yet been initiated and are still open for assessment. + References No definition available. + Details
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