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Inventories, Net (Inventories, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventories, Net [Abstract]    
Finished goods $ 1,236 $ 973
Work in process 357 421
Raw materials and accessories 370 481
Supplies and packing materials 475 445
Total inventories, net of inventory reserves $ 2,438 $ 2,320