Segment Information - Segment Information by Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total Net sales	$ 1,012	$ 896	$ 1,989	$ 1,761
Total operating income	125	58	269	98
Operating expenses reclassified	347	353	668	714
AIT
Segment Reporting Information [Line Items]
Total Net sales	351		703
Operating Segments
Segment Reporting Information [Line Items]
Total Net sales	1,012	897	1,989	1,763
Total operating income	150	131	322	253
Operating Segments | AIT
Segment Reporting Information [Line Items]
Total Net sales	351	313	703	635
Total operating income	77	61	169	135
Operating expenses reclassified	2		(5)		$ (14)
Operating Segments | EVM
Segment Reporting Information [Line Items]
Total Net sales	661	584	1,286	1,128
Total operating income	73	70	153	118
Operating expenses reclassified	2		5		$ (14)
Corporate, eliminations
Segment Reporting Information [Line Items]
Total Net sales	0	(1)	0	(2)
Total operating income	$ (25)	$ (73)	$ (53)	$ (155)