Retirement Plans - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Retirement Benefits [Abstract]
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	8	10	23	28
Expected return on plan assets	(14)	(13)	(40)	(37)
Amortization of net loss	0	1	1	3
Settlements	0	3	0	3
Net periodic pension benefit costs (credits)	$ (5)	$ 2	$ (14)	$ (1)