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Pension and Other Postretirement Benefits - Summary of Weighted-average Assumptions Used to Determine Benefit Obligations and Costs (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Weighted average assumptions used to determine benefit obligations as of December 31:      
Discount rate 3.00% 2.75% 3.25%
Rate of compensation increase 7.29% 7.29% 7.29%
Weighted average assumptions used to determine benefit costs for the years ended December 31:      
Discount rate 2.75% 3.25% 4.25%
Expected return on Pension Plan assets 7.00% 7.00% 7.00%
Rate of compensation increase 7.29% 7.29% 7.29%