Costs Associated with Exit and Restructuring Activities - Rollforward of Exit and Restructuring Accruals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	$ 7	$ 11	$ 8	$ 10
Charged to earnings, net	1	1	5	5
Cash paid	(4)	(5)	(9)	(8)
Balance at the end of the period	4	$ 7	4	$ 7
Accrued liabilities
Restructuring Reserve [Roll Forward]
Balance at the end of the period	3		3
Other long-term liabilities
Restructuring Reserve [Roll Forward]
Balance at the end of the period	$ 1		$ 1