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Employee Retirement Plans Summary classes of security by percentage (Details) | Dec. 28, 2019 | Dec. 29, 2018
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Non US Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Non US Plans | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 17.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 22.00% | 23.00%
Non US Plans | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 38.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 39.00% | 52.00%
Non US Plans | Money Market Instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 32.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 22.00% | 9.00%
Non US Plans | Other (real estate & commodities) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 13.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 13.00% | 14.00%
Non US Plans | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 4.00% | 2.00%
USPlans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
USPlans | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 48.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 51.00% | 42.00%
USPlans | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 37.00% | 49.00%
USPlans | Money Market Instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 4.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 2.00% | 1.00%
USPlans | Other (real estate & commodities) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 8.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 10.00% | 8.00%

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