v3.3.1.900
Derivatives and Hedging - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Derivative maximum risk of loss for credit protection $ 17    
Total Return Swaps [Member]      
Derivative [Line Items]      
Notional value 360 $ 238  
Total Return Swaps [Member] | Nonoperating Income (Expense) [Member]      
Derivative [Line Items]      
Amount of gains (losses) recognized in income on derivative instruments 11 (26) $ (15)
Interest Rate Swaps [Member]      
Derivative [Line Items]      
Notional value 46 84  
Interest Rate Swaps [Member] | Nonoperating Income (Expense) [Member]      
Derivative [Line Items]      
Amount of gains (losses) recognized in income on derivative instruments   (21)  
Forward Foreign Currency Exchange Contracts [Member]      
Derivative [Line Items]      
Notional value $ 169 $ 201  
Forward Foreign Currency Exchange Contracts [Member] | Other General and Administration Expense [Member]      
Derivative [Line Items]      
Amount of gains (losses) recognized in income on derivative instruments     $ (26)