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Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 5.50% 5.60% 3.00%
Discount rate 5.60% 3.00% 2.60%
Expected return on plan assets 5.80% 4.00% 3.80%
Other Postretirement Employee Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 5.30% 5.60% 2.90%
Discount rate 5.60% 2.90% 2.60%
Expected return on plan assets 0.00% 0.00% 0.00%