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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated (loss)/gain at beginning of period $ (103) $ (53) $ (121) $ (45)
Transfer of realized (gains)/losses in fair value to earnings (4) 8 3 66
Unrealized gain/(loss) in fair value 16 9 27 (57)
Accumulated (loss)/gain at end of period $ (91) $ (36) $ (91) $ (36)