Postretirement Benefits Other Than Pensions - Actuarial Assumptions of OPEB Expense (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Effective Rate for Interest on Service Cost	5.04%	2.54%	0.00%
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Weighted-average Discount Rate	5.11%	2.56%	1.99%
Service Cost Discount Rate	5.12%	2.79%	2.06%
Interest Cost Discount Rate	5.03%	1.97%	1.19%
Rate of Increase in Future Compensation Levels	2.20%	2.20%	2.20%