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Pension, Retiree Medical and Savings Plans (Weighted-Average Assumptions to Determine Projected Benefit Liability and Benefit Expense for Pension and Retiree Medical Plans) (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
United States Pension Plan of US Entity, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.40% | 2.90% | 2.50%
Service Cost Discount Rate | 3.10% | 2.60% | 3.40%
Interest cost discount rate | 3.10% | 2.00% | 2.90%
Expected return on plan assets (a) | 6.70% | 6.40% | 6.80%
Rate of salary increases | 3.20% | 3.00% | 3.00%
Rate of salary increases | 3.00% | 3.00% | 3.10%
International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.30% | 2.40% | 2.00%
Service Cost Discount Rate | 4.20% | 2.70% | 3.20%
Interest cost discount rate | 2.30% | 1.70% | 2.40%
Expected return on plan assets (a) | 5.30% | 5.30% | 5.60%
Rate of salary increases | 4.20% | 3.30% | 3.30%
Rate of salary increases | 3.30% | 3.30% | 3.30%
Retiree Medical Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.40% | 2.70% | 2.30%
Service Cost Discount Rate | 2.80% | 2.30% | 3.20%
Interest cost discount rate | 2.10% | 1.60% | 2.60%
Expected return on plan assets (a) | 5.70% | 5.40% | 5.80%

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- Definition The discount rate attributable to the interest cost component of benefit cost for the reporting period + References No definition available. + Details
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- Definition The discount rate attributable to the service cost component of benefit expense in the reporting period + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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