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Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Cost (Benefit) (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 5.50% 5.60% 3.00%
Expected return on plan assets 6.10% 5.80% 4.00%
Other Postretirement Employee Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 5.30% 5.60% 2.90%
Expected return on plan assets 0.00% 0.00% 0.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 6.30% 6.90%  
Other Postretirement Employee Benefit Plans | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 3.70% 3.70%  
Other Postretirement Employee Benefit Plans | OPEB Obligation      
Defined Benefit Plan Disclosure [Line Items]      
defined benefit plan, ultimate health care cost trend rates, with added benefits 4.50% 4.50%  
Other Postretirement Employee Benefit Plans | OPEB Obligation | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
defined benefit plan, ultimate health care cost trend rates, with added benefits 3.70% 3.70%  
Postemployment Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2074 2074