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Costs Associated with Exit and Restructuring Activities - Summary of Exit and Restructuring Costs Incurred (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Cumulative costs incurred $ 75 $ 65
Costs incurred 10  
Severance, related benefits and, other expenses    
Restructuring Cost and Reserve [Line Items]    
Cumulative costs incurred 63 54
Costs incurred 9  
Obligations for future non-cancellable lease payments    
Restructuring Cost and Reserve [Line Items]    
Cumulative costs incurred 12 $ 11
Costs incurred $ 1