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Debt - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Nov. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term debt, gross   $ 6,706   $ 5,972
Senior notes [member] | Senior notes due 2024 [Member]        
Debt Instrument [Line Items]        
Proceeds from issuance of long-term debt $ 1,000      
Long-term debt, gross   $ 1,000   0
Debt instrument, interest rate, stated percentage 4.25% 4.25%    
Debt issuance costs, gross $ 20      
Secured debt [member] | Senior secured term loan facility due 2020 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 750   4,225
Debt instrument, interest rate, stated percentage   3.50%    
Secured debt [member] | Senior secured revolving credit facility [Member]        
Debt Instrument [Line Items]        
Debt issuance costs, gross     $ 5  
Line of credit facility, maximum borrowing capacity   $ 1,000    
Letters of credit outstanding   45    
Line of credit facility, remaining borrowing capacity   $ 955    
Line of credit facility, unused capacity, commitment fee percentage   0.125%    
Secured debt [member] | Senior secured term loan facility due 2023 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross 3,225 $ 3,209   0
Debt instrument, interest rate, stated percentage   3.26%    
Debt issuance costs, gross $ 4      
Debt instrument, basis spread on variable rate 2.50%      
Debt instrument, unamortized discount $ 8      
Capital lease obligations [member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 227   227
Debt instrument, weighted average interest rate   6.34%    
Mortgages [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 20   $ 20
Debt instrument, weighted average interest rate   2.65%