Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Components of net periodic benefit cost:
Service cost	$ 2	$ 2	$ 7	$ 6
Interest cost	3	3	$ 8	8
Interest cost - location in statements of comprehensive income: miscellaneous, net			us-gaap:OtherNonoperatingIncomeExpense
Expected return on plan assets	(3)	(2)	$ (8)	(7)
Expected return on plan assets - location in statements of comprehensive income: miscellaneous, net			us-gaap:OtherNonoperatingIncomeExpense
Amortization and other	2	1	$ 5	4
Net periodic benefit cost	4	$ 4	12	$ 11
Defined benefit pension plan
Target allocation and pension plan asset allocation
Contributions expected to be made to defined benefit pension plans	$ 0		$ 0