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Income Taxes (TaxReturns) (Details) BRL in Millions, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) jurisdiction | Jun. 30, 2016 USD ($) | May 19, 2014 BRL | Dec. 31, 2005 BRL
Income Tax Examination |  |  |  |
Annual effective tax rate excluding discrete items (as a percent) | 78.00% | 25.70% |  |
Various discrete tax items | $ (147) | $ 8 |  |
Annual effective tax rate (as a percent) | 4.70% | 26.10% |  |
Income Tax Examination |  |  |  |
Number of jurisdictions with extensions beyond statute of limitations | jurisdiction | 2 |  |  |
Maximum number of years agreed to extensions beyond the statute of limitations | 20 years |  |  |
Brazil tax assessment for income tax returns | $ 254 |  |  | BRL 839
Minimum |  |  |  |
Income Tax Examination |  |  |  |
Range of tax returns are subject to examination | 3 years |  |  |
Maximum |  |  |  |
Income Tax Examination |  |  |  |
Range of tax returns are subject to examination | 6 years |  |  |
Norway Tax Assessments Prior to 2012 |  |  |  |
Income Tax Examination |  |  |  |
Norway tax assessment due to 2001 dividend payment, including interest | $ 0 |  |  |
Brazil Tax Assessments 2009 And 2010 |  |  |  |
Income Tax Examination |  |  |  |
Brazil tax assessment for income tax returns | $ 43 |  | BRL 143 |

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