Components of Net Periodic Pension Expense (Benefit) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
North America
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 2		$ 6
Interest cost	$ 7	9	$ 21	27
Expected return on plan assets	(8)	(11)	(24)	(32)
Net periodic pension expense (benefit)	(1)		(3)	1
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	2	1	4	4
Expected return on plan assets	$ (2)	$ (1)	$ (4)	(5)
Net periodic pension expense (benefit)				$ (1)