Postemployment Benefits Postretirement Benefit Plans - Weighted Average Assumptions Used, Net Postretirement Cost (Details) - Postretirement Plans	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Discount rate - Service cost	4.20%	3.60%	4.00%
Discount rate - Interest cost	3.80%	3.00%	3.00%
Expected rate of return on plan assets	5.40%	4.40%	0.00%
Health care cost trend rate	6.50%	6.70%	6.30%

Defined benefit plan, assumptions used calculating net periodic benefit cost, discount rate on interest cost

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- Definition

Defined benefit plan, assumptions used calculating net periodic benefit cost, discount rate on service cost

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan, assumptions used calculating net periodic benefit cost, health care cost trend rate

+ References

No definition available.

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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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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