Fair Value of Plan Assets (Detail) - United Kingdom - USD ($) $ in Millions	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 358	$ 360	$ 312
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	3
Developed Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	11
Emerging Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Mutual Funds Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	20
Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30	14
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49	49
UK Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154	140
Liability Term Matching Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	115	130
Emerging Markets Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	37
Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	300	308
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26	18
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Developed Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	11
Quoted Prices in Active Markets for Identical Assets (Level 1) | Emerging Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17	15
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	330	322
Significant Observable Inputs (Level 2) | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30	14
Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30	14
Significant Observable Inputs (Level 2) | UK Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154	140
Significant Observable Inputs (Level 2) | Liability Term Matching Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	115	130
Significant Observable Inputs (Level 2) | Emerging Markets Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Significant Observable Inputs (Level 2) | High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	37
Significant Observable Inputs (Level 2) | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	300	308
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	20
Significant Unobservable Inputs (Level 3) | Mutual Funds Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	20
Significant Unobservable Inputs (Level 3) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2	$ 20