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Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Taxes (Detail) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated gain/(loss) at beginning of period $ (121) $ (45)
Transfer of realized losses/(gains) in fair value to earnings 7 58
Unrealized gain/(loss) in fair value 11 (66)
Accumulated gain/(loss) at end of period $ (103) $ (53)