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Income Taxes (TaxReturns) (Details) NOK in Millions, BRL in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 NOK jurisdiction | Dec. 31, 2016 USD ($) | May 19, 2014 BRL | May 19, 2014 USD ($) | Dec. 31, 2005 BRL | Dec. 31, 2005 USD ($)
Income Tax Examination |  |  |  |  |  |
Number of jurisdictions with extensions beyond statute of limitations | 2 |  |  |  |  |
Maximum number of years agreed to extensions beyond the statute of limitations | 20 years |  |  |  |  |
Brazil tax assessment for income tax returns |  |  |  |  | BRL 818 | $ 251
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 | NOK 412 | $ 48 |  |  |  |
Brazil Tax Assessments 2009 And 2010 |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |
Brazil tax assessment for income tax returns |  |  | BRL 139 | $ 43 |  |

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