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Other Income, Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
May 26, 2016
May 06, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income, net          
Foreign exchange     $ (50) $ (28) $ (113)
Net loss on debt extinguishment       153 130
Net realized gains on Retained Shares transaction $ (537) $ (611)   (4,387)  
Gain on litigation settlement         (52)
Gain on sale of investments and other assets     (3) (3) (38)
Venezuela deconsolidation     33    
All other     6 (31) (32)
Other income, net     $ (14) $ (4,296) $ (105)