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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets, operating loss carryforwards, foreign   $ 295    
Deferred tax assets, tax credit carryforwards, AMT   59    
Deferred tax assets, tax credit carryforwards, foreign   89    
Increase (decrease) in valuation allowance   (122)    
Tax credit carryforward, valuation allowance   68    
Undistributed earnings related to foreign subsidiaries and foreign corporate joint ventures   3,000    
Unrecognized tax benefits that if recognized would affect our effective tax rate $ 98 13 $ 34 $ 98
Amount of unrecognized tax benefits and related liability which may be recognized or paid   32    
Accrued liabilities for interest and penalties 16 12 19 16
Interest and penalties (increased) decreased earnings   7 3  
Income tax expense (benefits) reflected in the Capital in Excess of Par column of the consolidated statement of equity   150 (34) $ (37)
Whitegate Refinery        
Increase (decrease) in valuation allowance   $ (45)    
Malaysian Refining Company        
Tax benefit attributable to excess tax basis included in Sale of foreign subsidiaries $ 224      
Immingham Combined Heat and Power Plant        
Tax benefit related to nontaxable gain included in Sale of foreign subsidiaries     $ 72