Benefit Plans - Significant Assumptions Used, Postretirement Benefits (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 29, 2019
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation discount rate at measurement date	2.98%	2.70%	3.32%
Net periodic postretirement benefit cost discount rate for fiscal year	2.70%	3.32%	4.41%
Pre Medicare
Defined Benefit Plan Disclosure [Line Items]
Weighted average healthcare cost trend rate	6.26%	6.53%	7.13%
Trend rate graded down to ultimate rate	4.50%	4.50%	4.50%
Post Medicare
Defined Benefit Plan Disclosure [Line Items]
Weighted average healthcare cost trend rate	6.54%	6.73%	7.11%
Trend rate graded down to ultimate rate	4.50%	4.50%	4.50%