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Commitments and Contingencies - Future Minimum Operating Lease Payments and Committed Subleases Under Non-cancelable Leases (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Operating lease obligations - Total Amounts $ 70    
Operating lease obligations - 2016 24    
Operating lease obligations - 2017 19    
Operating lease obligations - 2018 15    
Operating lease obligations - 2019 7    
Operating lease obligations - 2020 5    
Sublease rentals - Total Amounts (5)    
Sublease rentals - 2016 (3)    
Sublease rentals - 2017 (2)    
Sublease rentals - 2018 0    
Sublease rentals - 2019 0    
Sublease rentals - 2020 0    
Total committed operating leases less sublease rentals - Total Amounts 65    
Total committed operating leases less sublease rentals - 2016 21    
Total committed operating leases less sublease rentals - 2017 17    
Total committed operating leases less sublease rentals - 2018 15    
Total committed operating leases less sublease rentals - 2019 7    
Total committed operating leases less sublease rentals - 2020 5    
Rental expense 26 $ 26 $ 26
Sublease rental income $ 3 $ 3 $ 3