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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