Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Components of net periodic benefit cost:
Service cost	$ 2	$ 3
Interest cost	3	3
Expected return on plan assets	(2)	(3)
Amortization and other	1	1
Net periodic benefit cost	4	$ 4
Defined benefit pension plan
Target allocation and pension plan asset allocation
Contributions expected to be made to defined benefit pension plans	$ 0