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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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The estimated loss resulting from the income tax examination that has been accrued net of any adjustments as of the balance sheet date, excluding 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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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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