Retirement Plans and Other Postretirement Benefits - Weighted-Average Assumptions for Pensions and Other Benefits (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted-average assumptions used to determine benefit obligations
Rate of compensation increase	4.52%	4.57%
Initial healthcare cost trend rate (pre-65 participants)	6.25%	6.50%
Ultimate healthcare cost trend rate (pre-65 participants)	4.75%	4.75%
Number of years to ultimate trend rate (pre-65 participants)	5 years	6 years
Initial and ultimate healthcare cost trend rate (post-65 participants)	2.00%	2.00%
Interest crediting rate – cash balance pension plans	4.54%	4.50%
Weighted-average assumptions used to determine net periodic benefit costs
Initial healthcare cost trend rate (pre-65 participants)	6.50%	6.00%	6.50%
Ultimate healthcare cost trend rate (pre-65 participants)	4.75%	4.75%	4.75%
Number of years to ultimate trend rate (pre-65 participants)	5 years	3 years	4 years
Initial and ultimate healthcare cost trend rate (post-65 participants)	2.00%	2.00%	2.00%
Interest crediting rate – cash balance pension plans	4.50%	4.50%	4.50%
Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	5.21%	5.56%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	5.56%	2.92%	2.53%
Rate of compensation increase	4.57%	4.00%	4.00%
Expected long-term return on plan assets (as a percent)	6.70%	5.00%	5.30%
Other Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	5.23%	5.58%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate (as a percent)	5.58%	2.98%	2.63%
Expected long-term return on plan assets (as a percent)	6.80%	5.35%	4.90%