Schedule Of Reconciliation Of Changes In Projected Benefit Obligation, Fair Value Of Plan Assets And Funded Status Of Plan (Detail) - USD ($)	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ 0
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Obligation at beginning of period	141,000,000	$ 257,000,000
Interest cost	8,000,000	4,000,000	$ 4,000,000
Benefits paid	(7,000,000)	(8,000,000)
Actuarial loss/(gain)	17,000,000	(89,000,000)
Currency translation	8,000,000	23,000,000
Obligation at end of period	167,000,000	141,000,000	257,000,000
Fair value of plan assets at beginning of period	189,000,000	358,000,000
Actual return on plan assets	24,000,000	130,000,000
Company contributions	0	1,000,000
Benefits paid	(7,000,000)	(8,000,000)
Currency translation	9,000,000	(32,000,000)
Fair value of plan assets at end of period	$ 167,000,000	189,000,000	$ 358,000,000
Net amount recognized		$ 48,000,000