Employee Benefits - Assumptions Used to Determine Net Periodic Benefit Cost (Income) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Salaried VEBA
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.05%	2.95%	3.90%
Expected long-term return on plan assets	5.50%	5.50%	5.50%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.89%	3.10%	3.90%
Expected long-term return on plan assets	5.78%	4.45%	4.45%
Rate of compensation increase	2.74%	3.00%	3.00%
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.97%