Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Components of net periodic benefit cost:
Service cost	$ 2	$ 2	$ 5	$ 4
Interest cost	2	2	$ 5	5
Interest cost - location in statements of comprehensive income: miscellaneous, net			us-gaap:OtherNonoperatingIncomeExpense
Expected return on plan assets	(2)	(3)	$ (5)	(5)
Expected return on plan assets - location in statements of comprehensive income: miscellaneous, net			us-gaap:OtherNonoperatingIncomeExpense
Amortization and other	2	2	$ 3	3
Net periodic benefit cost	4	$ 3	8	$ 7
Defined benefit pension plan
Target allocation and pension plan asset allocation
Contributions expected to be made to defined benefit pension plans	$ 0		$ 0