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Derivative Instruments - Schedule of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Forward Interest Rate Swaps Designated in Hedging Relationship (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Net $ (48) $ (9) $ (9) $ (10)
Forward Interest Rate Swap Contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross (12) (12)    
Income tax (benefit) (5) (4)    
Net $ (7) $ (8)