Costs Associated with Exit and Restructuring Activities - Rollforward of Exit and Restructuring Accruals (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	$ 8	$ 10
Charged to earnings, net	4	4
Cash paid	(5)	(3)
Balance at the end of the period	$ 7	$ 11