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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 |

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