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Fair Value Hedges (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (loss) recognized in income on fair value of hedges $ (1) $ 13
Long-term Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain / (loss) recognized in income on fair value of hedges $ 1 $ (13)