Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Components of net periodic benefit cost:
Service cost		$ 2	$ 2	$ 4	$ 5
Interest cost		3	2	6	5
Expected return on plan assets		(3)	(2)	(5)	(5)
Amortization and other		3	2	4	3
Net periodic benefit cost		5	$ 4	9	$ 8
Forecast
Components of net periodic benefit cost:
Estimated withdrawal liability	$ 14
Time period over which quarterly installment payments will be made	20 years
Defined benefit pension plan
Target allocation and pension plan asset allocation
Contributions expected to be made to defined benefit pension plans		$ 0		$ 0