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Employee Retirement Plans Summary of the Basis Used to Measure Pension Plans' Assets at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
USPlans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 16,102 $ 13,589 $ 12,987
Defined Benefit Plan, Net Asset Value of Plan Assets 486 368  
Non US Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,296,539 1,173,865 $ 1,287,723
Defined Benefit Plan, Net Asset Value of Plan Assets 990,888 1,009,160  
Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Funds, Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 79,035 61,612  
Defined Benefit Plan, Net Asset Value of Plan Assets 79,035 61,612  
Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Arbitrage&Event [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 83,814 64,961  
Defined Benefit Plan, Net Asset Value of Plan Assets 83,814 64,961  
Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Directional Trading&Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 34,107 30,430  
Defined Benefit Plan, Net Asset Value of Plan Assets 34,107 30,430  
Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Cash & Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 48,440 38,099  
Defined Benefit Plan, Net Asset Value of Plan Assets 48,440 38,099  
Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Direct Sourcing [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,675 1,379  
Defined Benefit Plan, Net Asset Value of Plan Assets 1,675 1,379  
Leveraged Loans [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 30,755 11,025  
Defined Benefit Plan, Net Asset Value of Plan Assets 30,755 11,025  
Short Term Investment Fund [Member] | USPlans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 486 368  
Defined Benefit Plan, Net Asset Value of Plan Assets 486 368  
Short Term Investment Fund [Member] | Non US Plans [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 42,857 58,131  
Defined Benefit Plan, Net Asset Value of Plan Assets 18,871 50,515  
Equity Securities [Member] | USPlans [Member] | U S Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,485 3,055  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Equity Securities [Member] | USPlans [Member] | U S Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 474 512  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Equity Securities [Member] | USPlans [Member] | U S Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 475 455  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Equity Securities [Member] | USPlans [Member] | International Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,507 2,917  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Equity Securities [Member] | Non US Plans [Member] | Equity Securities, U K Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 178,093 87,828  
Defined Benefit Plan, Net Asset Value of Plan Assets 79,685 85,730  
Equity Securities [Member] | Non US Plans [Member] | Equity Securities, International, Developed [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 145,295 135,186  
Defined Benefit Plan, Net Asset Value of Plan Assets 128,668 131,639  
Equity Securities [Member] | Non US Plans [Member] | Equity Securities, Unquoted Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,687 3,189  
Defined Benefit Plan, Net Asset Value of Plan Assets 3,687 3,189  
Equity Securities [Member] | Non US Plans [Member] | Equity Securities, international, Emerging [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 7,261 6,803  
Defined Benefit Plan, Net Asset Value of Plan Assets 6,876 6,724  
Fixed Income [Member] | USPlans [Member] | Government/Corporate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,744 4,367  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Fixed Income [Member] | USPlans [Member] | High Yield Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 809 971  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,750 3,812  
Defined Benefit Plan, Net Asset Value of Plan Assets 3,750 3,812  
Fixed Income [Member] | Non US Plans [Member] | Fixed Income,Convertible Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 187 160  
Defined Benefit Plan, Net Asset Value of Plan Assets 187 160  
Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Index Linked [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 228,699 212,327  
Defined Benefit Plan, Net Asset Value of Plan Assets 224,644 208,122  
Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 46,065 107,882  
Defined Benefit Plan, Net Asset Value of Plan Assets 46,065 107,779  
Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, U K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 347,840 317,621  
Defined Benefit Plan, Net Asset Value of Plan Assets 321,176 292,409  
Alternative Investment [Member] | USPlans [Member] | Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 469 539  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Alternative Investment [Member] | USPlans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 653 405  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Alternative Investment [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (131,387) (98,885)  
Defined Benefit Plan, Net Asset Value of Plan Assets (131,484) (98,980)  
Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds, Direct [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 135,238 121,612  
Defined Benefit Plan, Net Asset Value of Plan Assets 0 0  
Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds,Indirect [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,128 10,693  
Defined Benefit Plan, Net Asset Value of Plan Assets 10,937 10,555  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | USPlans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 15,616 13,221  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non US Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 140,044 26,000  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Funds, Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Arbitrage&Event [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Directional Trading&Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Cash & Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Direct Sourcing [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Leveraged Loans [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short Term Investment Fund [Member] | USPlans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short Term Investment Fund [Member] | Non US Plans [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8,135 4,730  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | USPlans [Member] | U S Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,485 3,055  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | USPlans [Member] | U S Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 474 512  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | USPlans [Member] | U S Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 475 455  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | USPlans [Member] | International Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,507 2,917  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, U K Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 98,408 2,098  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, International, Developed [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 16,627 3,547  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, Unquoted Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, international, Emerging [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 385 79  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | USPlans [Member] | Government/Corporate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,744 4,367  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | USPlans [Member] | High Yield Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 809 971  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income,Convertible Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Index Linked [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,055 4,205  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, U K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12,247 11,203  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative Investment [Member] | USPlans [Member] | Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 469 539  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative Investment [Member] | USPlans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 653 405  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative Investment [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (4) 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds, Direct [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds,Indirect [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 191 138  
Fair Value, Inputs, Level 2 [Member] | Non US Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 165,506 138,610  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Funds, Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Arbitrage&Event [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Directional Trading&Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Cash & Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Direct Sourcing [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Leveraged Loans [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Short Term Investment Fund [Member] | Non US Plans [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 15,851 2,886  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, U K Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, International, Developed [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, Unquoted Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, international, Emerging [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income,Convertible Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Index Linked [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 103  
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, U K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,417 14,009  
Fair Value, Inputs, Level 2 [Member] | Alternative Investment [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds, Direct [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 135,238 121,612  
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds,Indirect [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Non US Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 101 95  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Funds, Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Arbitrage&Event [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Directional Trading&Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Cash & Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds, Multi-strategy [Member] | Non US Plans [Member] | Hedge Fund, Direct Sourcing [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Leveraged Loans [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Short Term Investment Fund [Member] | Non US Plans [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, U K Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, International, Developed [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, Unquoted Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Non US Plans [Member] | Equity Securities, international, Emerging [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income,Convertible Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, Index Linked [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Non US Plans [Member] | Fixed Income, Government/Corporate, U K [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Alternative Investment [Member] | Non US Plans [Member] | Commodities Investment [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 101 95  
Fair Value, Inputs, Level 3 [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds, Direct [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Real Estate Funds [Member] | Non US Plans [Member] | Real Estate Funds,Indirect [Domain]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 $ 0  
[1] Represents collective short term investment fund, composed of high-grade money market instruments with short maturities.