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Fair Value Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (loss) recognized in income on fair value of hedges $ 4 $ (13) $ 8 $ 1
Long-term Debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (loss) recognized in income on fair value of hedges $ (4) $ 13 $ (8) $ (1)