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