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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventories [Line Items]    
Finished products $ 2,714 $ 2,689
Raw and packaging materials 1,432 1,454
Products in process 605 597
Materials in transit and payments on account 220 184
Inventories $ 4,971 $ 4,924