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Business Segments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
segment
Oct. 01, 2015
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | segment 4        
Concentrations of cash and cash equivalents $ 1,476   $ 2,161 $ 2,996 $ 2,281
Operating Segments | Europe, Middle East and Africa          
Segment Reporting Information [Line Items]          
Concentrations of cash and cash equivalents $ 513   $ 517    
Percent of concentrations of cash and cash equivalents 35.00%   24.00%    
Operating Segments | Asia Pacific          
Segment Reporting Information [Line Items]          
Concentrations of cash and cash equivalents $ 415   $ 462    
Percent of concentrations of cash and cash equivalents 28.00%   21.00%    
Operating Segments | Latin America          
Segment Reporting Information [Line Items]          
Concentrations of cash and cash equivalents $ 114   $ 409    
Percent of concentrations of cash and cash equivalents 8.00%   19.00%    
NGY          
Segment Reporting Information [Line Items]          
Equity interest prior to dissolution   25.00%      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | DGT          
Segment Reporting Information [Line Items]          
Equity interest prior to dissolution   25.00%