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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Accumulated gain / (loss) at beginning of period $ (45) $ (2) $ 117
Transfer of realized losses / (gains) in fair value to earnings 53   (40)
Unrealized gain / (loss) in fair value (129) (43) (79)
Accumulated gain / (loss) at end of period $ (121) $ (45) $ (2)