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Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in millions):



	March 31, 2019				December 31, 2018
Raw materials	$	276			$	257
Work in process	1,770				1,660
Finished goods	970				1,023
Total inventories	$	3,016			$	2,940