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Fair Value of Plan Assets (Detail) - UK - USD ($) $ in Millions | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 282 | $ 313 | $ 278
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 13 | 16 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 250 | 277 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 54 | 60 |
Equity Securities | Developed Markets Equity Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 11 |
Equity Securities | Emerging Markets Equity Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 4 |
Equity Securities | Mutual Funds Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Equity Securities | Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23 | 25 |
Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12 | 15 |
Equity Securities | 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 | 8 | 11 |
Equity Securities | 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 |
Equity Securities | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23 | 25 |
Equity Securities | Significant Observable Inputs (Level 2) | Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23 | 25 |
Equity Securities | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Equity Securities | Significant Unobservable Inputs (Level 3) | Mutual Funds Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 20 |
Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 227 | 252 |
Fixed Income Securities | UK Debt Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 91 | 100 |
Fixed Income Securities | Liability Term Matching Debt Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 115 | 132 |
Fixed Income Securities | Emerging Markets Debt Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3 | 1 |
Fixed Income Securities | High Yield Debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 18 | 19 |
Fixed Income Securities | Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 227 | 252 |
Fixed Income Securities | Significant Observable Inputs (Level 2) | UK Debt Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 91 | 100 |
Fixed Income Securities | Significant Observable Inputs (Level 2) | Liability Term Matching Debt Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 115 | 132 |
Fixed Income Securities | Significant Observable Inputs (Level 2) | Emerging Markets Debt Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3 | 1 |
Fixed Income Securities | Significant Observable Inputs (Level 2) | High Yield Debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 18 | $ 19 |

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