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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding discrete items.

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The estimated loss resulting from the income tax examination that has been accrued net of any adjustments as of the balance sheet date, including interest and penalties by the Brazilian taxing authorities.

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Maximum number of years the enterprise has agreed to extensions beyond the statute of limitations in two major jurisdictions.

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Range of period that the tax returns in the major jurisdictions in which the enterprise operates are generally subject to examination.

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Tax assessments by Norway on entity's actions involving dividend payment.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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