Fair Value of Plan Assets (Detail) - UNITED KINGDOM - USD ($) $ in Millions	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 167	$ 189	$ 358
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	165
Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9
UK Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		86
Liability Term Matching Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		76
High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		17
Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		179
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		188
Significant Observable Inputs (Level 2) | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9
Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9
Significant Observable Inputs (Level 2) | UK Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		86
Significant Observable Inputs (Level 2) | Liability Term Matching Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		76
Significant Observable Inputs (Level 2) | High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		17
Significant Observable Inputs (Level 2) | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 179
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	165
Significant Unobservable Inputs (Level 3) | Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 165