Pension Plans and Other Postretirement Benefit Plans - Investment Allocation Percentages By Asset Classes (Details)	Dec. 31, 2021	Dec. 31, 2020
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	55.00%	35.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	40.00%	49.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	5.00%	7.00%
Absolute Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	0.00%	9.00%