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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2013
Loss Contingencies [Line Items]        
Accrual relating to the current best estimate of probable liabilities       $ 3
Maximum future payment obligation of the guaranteed value and associated liabilities 4      
Rental expense 26 25 23  
Sublease rental income $ 3 $ 3 $ 3