Benefit Plans - Assumptions (Details)	12 Months Ended			36 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
Weighted average assumptions used to determine net periodic benefit cost
Defined Benefit Plan, Tax Status [Extensible Enumeration]				Qualified Plan (ERP)
Pension Plan
Weighted average assumptions used to determine net periodic benefit cost
Expected long term return on plan assets (as a percent)	4.75%	3.05%	2.75%
Postretirement healthcare benefits
Assumed healthcare cost trend rates (reaches ultimate trend rate in 2026)
Healthcare cost trend rate assumed for next year (as a percent)	6.00%	6.00%	6.00%	6.00%
Rate to which the cost trend is assumed to decline (the ultimate trend rate) (as a percent)	5.00%	5.00%	5.00%	5.00%
Qualified Plan (ERP) | Pension Plan
Weighted average assumptions were used to determine benefit obligations
Discount rate (as a percent)	5.22%	5.57%		5.22%
Weighted average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	5.57%	2.77%	2.37%
Nonqualified Plan | Pension Plan
Weighted average assumptions were used to determine benefit obligations
Discount rate (as a percent)	5.22%	5.57%		5.22%
Weighted average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	5.57%	2.77%	2.37%
Nonqualified Plan | Other Benefits
Weighted average assumptions were used to determine benefit obligations
Discount rate (as a percent)	5.22%	5.57%		5.22%
Weighted average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	5.57%	2.77%	2.37%