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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
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated gain / (loss) at beginning of period $ (45) $ (2)
Transfer of realized losses / (gains) in fair value to earnings 58 (18)
Unrealized gain / (loss) in fair value (66) (26)
Accumulated gain / (loss) at end of period $ (53) $ (46)