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Benefit Plans - Significant Assumptions Used, Postretirement Benefits (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pre Medicare      
Defined Benefit Plan Disclosure [Line Items]      
Weighted average healthcare cost trend rate 7.88% 6.58% 6.04%
Weighted average healthcare cost trend rate 6.58% 6.04% 6.26%
Trend rate graded down to ultimate rate 4.50% 4.50% 4.50%
Post Medicare      
Defined Benefit Plan Disclosure [Line Items]      
Weighted average healthcare cost trend rate 8.65% 6.89% 6.29%
Weighted average healthcare cost trend rate 6.89% 6.29% 6.54%
Trend rate graded down to ultimate rate 4.50% 4.50% 4.50%
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation discount rate 5.02% 5.19% 2.98%
Net periodic postretirement benefit cost discount rate for fiscal year 5.19% 2.98% 2.70%