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Retirement Benefits (Assumptions used to determine obligations and cost) (Details)
12 Months Ended
Dec. 29, 2023
Dec. 30, 2022
Dec. 31, 2021
Pension Benefits | U.S. Plans      
Assumptions used to determine net period benefit obligation      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.30% 5.60%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 2.70% 2.70%  
Assumptions used to determine net periodic benefit cost      
Discount rate 5.60% 3.00% 2.60%
Rate of compensation increase 2.70% 2.70% 2.70%
Expected return on assets 7.60% 6.30% 6.30%
Pension Benefits | Non-U.S. Plans      
Assumptions used to determine net period benefit obligation      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.10% 2.40%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 1.70% 1.80%  
Assumptions used to determine net periodic benefit cost      
Discount rate 0.40% 0.40% 0.40%
Rate of compensation increase 1.30% 1.30% 1.30%
Expected return on assets 1.60% 1.00% 1.00%
Postretirement Medical Benefits | U.S. Plans      
Assumptions used to determine net period benefit obligation      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.30% 5.60%  
Assumptions used to determine net periodic benefit cost      
Discount rate 5.60% 2.90% 2.60%