Commitments and Contingencies - Future Minimum Lease Payments Required under Non-Cancellable Operating Leases (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Operating Leases Future Minimum Payments Due [Abstract]  
2014 $ 13
2015 10
2016 8
2017 6
2018 5
Thereafter 19
Total $ 61