Postemployment Benefits - Postretirement Benefit Plans - Weighted Average Assumptions Used, Net Postretirement Cost (Details) - Postretirement Benefits	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Defined Benefit Plan Disclosure [Line Items]
Discount rate - Service cost	5.50%	2.80%	2.70%
Discount rate - Interest cost	5.40%	3.40%	1.60%
Expected rate of return on plan assets	6.30%	5.40%	4.40%
Health care cost trend rate	6.20%	6.60%	5.90%