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Income Taxes (TaxReturns) (Details) NOK in Millions, BRL in Millions, $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) jurisdiction | Sep. 30, 2015 USD ($) | Sep. 30, 2016 NOK | Sep. 30, 2016 USD ($) | Apr. 30, 2016 USD ($) | May 19, 2014 BRL | Dec. 31, 2005 BRL
Income Tax Examination |  |  |  |  |  |  |
Annual effective tax rate (as a percent) | 21.50% | 18.00% |  |  |  |  |
Various discrete tax items | $ 34 | $ 9 |  |  |  |  |
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 |  |  |  | $ 247 |  |  | BRL 806
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 | 52 |  |  |
2010 and 2011 federal income tax returns |  |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |  |
Amount of refund expected on a final settlement |  |  |  |  | $ 31 |  |
Brazil Tax Assessments 2009 And 2010 |  |  |  |  |  |  |
Income Tax Examination |  |  |  |  |  |  |
Brazil tax assessment for income tax returns |  |  |  | $ 42 |  | BRL 137 |

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