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Fair Value Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (loss) recognized in income on fair value of hedges $ 5 $ 4
Long-term Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (loss) recognized in income on fair value of hedges $ (5) $ (4)