Employee Retirement Benefits - Assumptions Used for Periodic Income (Details) - Pension Benefits [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.53%	3.22%	4.26%
Salary increase	4.40%	4.40%	4.40%
Expected long-term rate of return, net of management fees	7.35%	7.35%	7.35%
Weighted-average interest crediting rate	3.82%	3.83%	3.88%