Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in millions):

	March 31, 2018		December 31, 2017
Raw materials	$	275	$	232
Work in process	1,627		1,668
Finished goods	1,050		934
Total inventories	$	2,952	$	2,834