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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, 2016 | Dec. 26, 2015 | Dec. 27, 2014
United States Pension Plan of US Entity, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Liability discount rate | 4.40% | 4.50% | 4.20%
Interest cost discount rate | 3.80% |  |
Service Cost Discount Rate | 4.60% |  |
Expense discount rate (a) |  | 4.20% | 5.00%
Expected return on plan assets | 7.50% | 7.50% | 7.50%
Liability rate of salary increases | 3.10% | 3.10% | 3.50%
Expense rate of salary increases | 3.10% | 3.50% | 3.70%
International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Liability discount rate | 3.10% | 4.00% | 3.80%
Interest cost discount rate | 3.50% |  |
Service Cost Discount Rate | 4.10% |  |
Expense discount rate (a) |  | 3.80% | 4.70%
Expected return on plan assets | 6.20% | 6.50% | 6.60%
Liability rate of salary increases | 3.60% | 3.60% | 3.60%
Expense rate of salary increases | 3.60% | 3.60% | 3.90%
Retiree Medical Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Liability discount rate | 4.00% | 4.20% | 3.80%
Interest cost discount rate | 3.30% |  |
Service Cost Discount Rate | 4.30% |  |
Expense discount rate (a) |  | 3.80% | 4.30%
Expected return on plan assets | 7.50% | 7.50% | 7.50%

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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 The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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