Fair value of Plan Assets (Detail) (Europe, USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	$ 257	$ 232	$ 216
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	1	1
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	132	123
Equity Securities | Developed Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	81	77
Equity Securities | Emerging Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	27	16
Equity Securities | Mutual Funds Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	7	8
Equity Securities | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	17	22
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	124	108
Fixed Income Securities | UK debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	21	19
Fixed Income Securities | Liability Term Matching Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	80	73
Fixed Income Securities | Emerging Markets Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	9	9
Fixed Income Securities | High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	14	7
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	109	84
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	1	1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	108	83
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities | Developed Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	81	69
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities | Emerging Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	27	14
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	141	141
Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	17	33
Significant Observable Inputs (Level 2) | Equity Securities | Developed Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total		8
Significant Observable Inputs (Level 2) | Equity Securities | Emerging Markets Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total		2
Significant Observable Inputs (Level 2) | Equity Securities | Mutual Funds Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total		1
Significant Observable Inputs (Level 2) | Equity Securities | Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	17	22
Significant Observable Inputs (Level 2) | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	124	108
Significant Observable Inputs (Level 2) | Fixed Income Securities | UK debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	21	19
Significant Observable Inputs (Level 2) | Fixed Income Securities | Liability Term Matching Debt Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	80	73
Significant Observable Inputs (Level 2) | Fixed Income Securities | Emerging Markets Debt Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	9	9
Significant Observable Inputs (Level 2) | Fixed Income Securities | High Yield Debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	14	7
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	7	7
Significant Unobservable Inputs (Level 3) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	7	7
Significant Unobservable Inputs (Level 3) | Equity Securities | Mutual Funds Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, total	$ 7	$ 7