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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
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated gain / (loss) at beginning of period $ (53) $ (46) $ (45) $ (2)
Transfer of realized losses / (gains) in fair value to earnings 8 (36) 66 (54)
Unrealized gain / (loss) in fair value 9 29 (57) 3
Accumulated gain / (loss) at end of period $ (36) $ (53) $ (36) $ (53)