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Inventories, Net of Inventory Reserves (Inventories, Net) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventories, Net of Inventory Reserves [Abstract]    
Finished goods $ 786 $ 739
Work in process 340 322
Raw materials and accessories 350 306
Supplies and packing materials 358 345
Total inventories, net of inventory reserves $ 1,834 $ 1,712