Leases - Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Lease expense:
Operating lease cost	$ 34	$ 33	$ 101	$ 99
Finance lease cost
Amortization of right-of-use assets	3	3	9	9
Interest on lease liabilities	0	1	1	1
Total finance lease cost	3	4	10	10
Short-term lease cost	1	1	2	4
Variable cost	10	8	27	25
Sublease income	(2)	(1)	(4)	(3)
Net lease expense	$ 46	$ 45	$ 136	$ 135