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Inventories, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 217 $ 199
Work in process 70 107
Finished goods 1,492 1,424
Inventories, net 1,779 1,730
Inventories reserves $ 39 $ 73