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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Inventories, net of reserves
Inventories, net of reserves of $413 million and $360 million as of June 30, 2018 and December 31, 2017, respectively, are comprised of the following:
 
June 30, 2018
December 31, 2017
Finished goods
$
2,656

$
2,577

Work in process and raw material
2,019

1,930

Total inventories, net
$
4,675

$
4,507