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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventories [Line Items]    
Finished products $ 2,665 $ 2,689
Raw and packaging materials 1,328 1,454
Products in process 590 597
Materials in transit and payments on account 148 184
Inventories $ 4,731 $ 4,924