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Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Income, Net of Taxes (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Accumulated gain / (loss) at beginning of period $ (2) $ 117 $ (38)
Transfer of realized losses / (gains) to earnings   (40) 53
Unrealized gain / (loss) in fair value (43) (79) 102
Accumulated gain / (loss) at end of period $ (45) $ (2) $ 117