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Debt - Senior Notes - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 3,700 $ 3,800
2016 Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt 594  
Unamortized deferred financing costs $ 6  
Interest Rate 5.875%  
Redemption price percentage of principal amount 105.875%  
Redemption premium percentage 40.00%  
2016 Senior Notes [Member] | On or After June 15, 2019 [Member]    
Debt Instrument [Line Items]    
Redemption price percentage of principal amount 102.938%  
2016 Senior Notes [Member] | June 15, 2020 [Member]    
Debt Instrument [Line Items]    
Redemption price percentage of principal amount 101.469%  
2016 Senior Notes [Member] | June 15, 2021 [Member]    
Debt Instrument [Line Items]    
Redemption price percentage of principal amount 100.00%