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Inventories, Net (Notes)
3 Months Ended
Mar. 31, 2018
Inventory, Net [Abstract]  
Inventories, Net
Inventories, Net.
Inventories, net consists of the following:
  
March 31, 2018
 
December 31, 2017
 
(in millions)
Raw materials
$
588

 
$
531

Work in process
378

 
338

Finished goods
2,531

 
2,392

 
$
3,497

 
$
3,261