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Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 5,389 $ 4,821
Work in process and other 3,290 2,541
Finished manufactured goods 4,446 4,412
Goods acquired for resale 7,066 7,434
Total inventory $ 20,191 $ 19,208