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Employee Benefit Plans - Post Retirement Benefit Plans, Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Maximum percentage of plan assets that can be in the common stock of Hartford   10.00%    
Non-elective contribution percent   2.00%    
Percent of employer matching contribution   6.00%    
Limit of employee compensation annually   $ 1,000,000    
Total cost to company related to Investment and Savings Plan   $ 163,000,000 $ 142,000,000 $ 147,000,000
Defined Benefit Plan, Assumptions Used in Calculation, Description   The interest crediting rate on the cash balance plan is the greater of the average annual yield on 10-year U.S. Treasury Securities published in December of the prior calendar year or 3.3%.    
Fair value of plan assets had fair value of rabbi trusts been included   $ 3,771,000,000 3,694,000,000  
Funded status of plan had fair value of rabbi trust assets been included   $ 168,000,000 $ 204,000,000  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.15%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   6.10% 5.10%  
Defined Benefit Plan, Benefit Obligation   $ 3,603,000,000 $ 3,490,000,000 4,649,000,000
Assets held in rabbi trusts and designated for the non-qualified pension plans   198,000,000 170,000,000  
Assets held in rabbi trusts and designated for non qualified pension plans, contributions by employer   3,000,000    
Plan assets at fair value in the fair value hierarchy   $ 3,573,000,000 $ 3,524,000,000 $ 4,482,000,000
Pension Plan [Member] | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 5.90%      
Pension Plan [Member] | Fixed income securities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   81.00% 73.00%  
Pension Plan [Member] | Fixed income securities | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 81.00%      
Pension Plan [Member] | Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   19.00% 27.00%  
Pension Plan [Member] | Equity Securities [Member] | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 19.00%      
Pension Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets at fair value in the fair value hierarchy   $ 1,000,000 $ 1,000,000  
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.13% 5.39% 2.72%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   4.50% 4.80% 4.90%
Defined Benefit Plan, Benefit Obligation   $ 138,000,000 $ 143,000,000 $ 197,000,000
Plan assets at fair value in the fair value hierarchy   $ 18,000,000 $ 30,000,000 $ 51,000,000
Other Postretirement Benefits Plan [Member] | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.50%      
Other Postretirement Benefits Plan [Member] | Fixed income securities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00% 75.00%  
Other Postretirement Benefits Plan [Member] | Fixed income securities | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%      
Other Postretirement Benefits Plan [Member] | Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     25.00%  
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets at fair value in the fair value hierarchy   $ 0 $ 0  
Other Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.14% 5.40% 2.83%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   4.40% 3.30% 2.90%
Defined Benefit Plan, Benefit Obligation   $ 334,000,000 $ 334,000,000 $ 439,000,000
Plan assets at fair value in the fair value hierarchy   $ 11,000,000 $ 11,000,000 $ 15,000,000
Other Pension Plan | Change in Assumptions for Defined Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.14% 5.40% 2.83%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   $ (7,000,000) $ (92,000,000)  
Cash Balance Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation   357,000,000 338,000,000  
Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Total cost to company related to Investment and Savings Plan   $ 3,000,000 $ 3,000,000 $ 3,000,000
UNITED STATES | Change in Assumptions for Defined Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.15% 5.43% 2.91%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   $ (88,000,000) $ (997,000,000)  
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.15% 5.43% 2.91%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   6.10% 5.10% 5.40%
Defined Benefit Plan, Benefit Obligation   $ 3,269,000,000 $ 3,156,000,000 $ 4,210,000,000
Plan assets at fair value in the fair value hierarchy   $ 3,562,000,000 $ 3,513,000,000 $ 4,467,000,000