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Fair value of Plan Assets (Detail) - Europe - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total $ 278 $ 240 $ 257
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 25    
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 60 120  
Equity Securities | Developed Markets Equity Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 19 70  
Equity Securities | Emerging Markets Equity Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 7 15  
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 27 27  
Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 193 120  
Fixed Income Securities | UK debt funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 62 25  
Fixed Income Securities | Liability Term Matching Debt Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 109 71  
Fixed Income Securities | Emerging Markets Debt Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 2 8  
Fixed Income Securities | High Yield Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 20 16  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 51 85  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 25    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 26 85  
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 19 70  
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 7 15  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 220 147  
Significant Observable Inputs (Level 2) | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 27 27  
Significant Observable Inputs (Level 2) | Equity Securities | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 27 27  
Significant Observable Inputs (Level 2) | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 193 120  
Significant Observable Inputs (Level 2) | Fixed Income Securities | UK debt funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 62 25  
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 109 71  
Significant Observable Inputs (Level 2) | Fixed Income Securities | Emerging Markets Debt Fund      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 2 8  
Significant Observable Inputs (Level 2) | Fixed Income Securities | High Yield Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 20 16  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 7 8  
Significant Unobservable Inputs (Level 3) | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total 7 8  
Significant Unobservable Inputs (Level 3) | Equity Securities | Mutual Funds Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets, total $ 7 $ 8