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Employee Benefit Plans - Narrative (Details)
12 Months Ended
Dec. 31, 2024
USD ($)
plan
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 17,000,000 $ 20,000,000  
Percentage within which the planned allocation is managed 5.00%    
Net actuarial gain (loss) $ 107,000,000 (20,000,000)  
Projected benefit obligation 186,000,000    
Accumulated benefit obligation 178,000,000    
Projected benefit obligation 0    
Plan benefit accruals $ 2,115,000,000 2,252,000,000  
Growth-Oriented      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage of pension plan assets 33.00%    
Immunizing      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation percentage of pension plan assets 67.00%    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 0 0 $ 0
Expected contributions expected in the next fiscal year 0    
Net actuarial gain (loss) $ 107,000,000 $ (20,000,000)  
Increase (decrease) in weighted average discount rate 0.68% (0.20%)  
Pre-tax (loss) gain to be amortized related to post-retirement obligations $ (519,000,000)    
Pension Plan | Quality Carriers, Inc. | Multiemployer Plan, Union-represented Employees      
Defined Benefit Plan Disclosure [Line Items]      
Number of multi-employer pension plans | plan 2    
Contingent liability for full withdrawal or termination of multi-employer plan $ 285,000,000    
Pension Plan | Quality Carriers, Inc. | Multiemployer Plan, Union-represented Employees, Central Southeast and Southwest Areas Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Contingent liability for full withdrawal or termination of multi-employer plan 280,000,000    
Postretirement Health Coverage      
Defined Benefit Plan Disclosure [Line Items]      
Plan benefit accruals 49,000,000 $ 56,000,000  
Defined benefit plan, expected future benefit payments 46,000,000    
Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Expense associated with savings plans $ 40,000,000 $ 35,000,000 $ 28,000,000