Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Components of net periodic benefit cost:
Service cost	$ 3	$ 2
Interest cost	3	3
Expected return on plan assets	(3)	(2)
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