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Benefit Plans - Assumptions (Details)
 12 Months Ended 36 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Weighted average assumptions used to determine net periodic benefit cost        
Defined Benefit Plan, Tax Status [Extensible Enumeration]       Qualified Plan [Member]
Pension Plan [Member]        
Weighted average assumptions used to determine net periodic benefit cost        
Expected long term return on plan assets (as a percent) 4.75% 4.75% 3.05%  
Postretirement Health Coverage [Member]        
Assumed healthcare cost trend rates (reaches ultimate trend rate in 2026)        
Healthcare cost trend rate assumed for next year (as a percent) 7.00% 6.00% 6.00% 7.00%
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 [Member] | Pension Plan [Member]        
Weighted average assumptions were used to determine benefit obligations        
Discount rate (as a percent) 5.59% 5.22%   5.59%
Weighted average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 5.22% 5.57% 2.77%  
Nonqualified Plan [Member] | Pension Plan [Member]        
Weighted average assumptions were used to determine benefit obligations        
Discount rate (as a percent) 5.59% 5.22%   5.59%
Weighted average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 5.22% 5.57% 2.77%  
Nonqualified Plan [Member] | Other Postretirement Benefits Plan [Member]        
Weighted average assumptions were used to determine benefit obligations        
Discount rate (as a percent) 5.59% 5.22%   5.59%
Weighted average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 5.22% 5.57% 2.77%