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Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details) | Dec. 28, 2019 | Dec. 29, 2018
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Fixed Income |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage |  | 47.00%
U.S. Equity |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage |  | 29.00%
International Equity |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage |  | 20.00%
Real Estate Funds [Member] |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage |  | 4.00%
Scenario, Forecast [Member] | Fixed Income |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage | 47.00% |
Scenario, Forecast [Member] | U.S. Equity |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage | 29.00% |
Scenario, Forecast [Member] | International Equity |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage | 20.00% |
Scenario, Forecast [Member] | Real Estate Funds [Member] |  |
Target Asset Allocation [Line Items] |  |
Target investment allocation percentage | 4.00% |

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- Definition [Line Items] for Target asset allocation [Table] + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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