Pension and Other Postretirement Benefits Plans - Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Postretirement Plans [Member]
Discount rate, net periodic benefit	4.93%	2.58%	2.18%
Initial	7.50%	7.50%	7.50%
Ultimate (year 2026)	4.44%	5.00%	5.00%
Retirement Plan [Member]
Discount rate, benefit obligation	4.73%	4.93%
Discount rate, net periodic benefit	4.93%	2.58%	2.18%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	4.75%	4.25%	4.75%
Rate of return on plan assets	4.75%	4.25%	4.75%
Other Postretirement Benefits Plan [Member]
Discount rate, benefit obligation	4.73%	4.93%
Initial	7.50%	7.50%
Ultimate (year 2026)	4.54%	4.44%
Directors' Plan [Member]
Discount rate, benefit obligation	4.73%	4.93%	2.58%
Discount rate, net periodic benefit	4.93%	2.58%	2.18%