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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories Inventories consisted of the following:
 
As of September 30,
2018
 
As of December 31,
2017
 
(in millions)
Raw materials
$
743

 
$
711

Finished product
2,227

 
1,975

 
2,970

 
2,686

Inventory reserves
(128
)
 
(129
)
Inventories, net
$
2,842

 
$
2,557