Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

A summary of inventories is shown below:

	December 31, 2017		December 31, 2016
	(in millions)
Productive material	$	584	$	491
Work-in-process	100		72
Finished goods	399		296
Total	$	1,083	$	859