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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventories [Line Items]    
Finished products $ 2,641 $ 2,665
Raw and packaging materials 1,357 1,328
Products in process 613 590
Materials in transit and payments on account 171 148
Inventories $ 4,782 $ 4,731