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Employee Benefit Plans - Post Retirement Benefit Plans, Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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   $ 193,000,000 $ 163,000,000 $ 142,000,000
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   $ 3,641,000,000 3,771,000,000  
Funded status of plan had fair value of rabbi trust assets been included   $ 253,000,000 $ 168,000,000  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.65%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   5.90% 6.10%  
Defined Benefit Plan, Benefit Obligation   $ 3,388,000,000 $ 3,603,000,000 3,490,000,000
Assets held in rabbi trusts and designated for the non-qualified pension plans   245,000,000 198,000,000  
Assets held in rabbi trusts and designated for non qualified pension plans, contributions by employer   0 3,000,000  
Plan assets at fair value in the fair value hierarchy   $ 3,396,000,000 3,573,000,000 $ 3,524,000,000
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 6.40%      
Pension Plan [Member] | Fixed income securities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   81.00%    
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%    
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   5.56% 5.13% 5.39%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   4.50% 4.50% 4.80%
Defined Benefit Plan, Benefit Obligation   $ 122,000,000 $ 138,000,000 $ 143,000,000
Plan assets at fair value in the fair value hierarchy   $ 8,000,000 $ 18,000,000 $ 30,000,000
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 4.80%      
Other Postretirement Benefits Plan [Member] | Fixed income securities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00% 100.00%  
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] | 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   5.59% 5.14% 5.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   4.00% 4.40% 3.30%
Defined Benefit Plan, Benefit Obligation   $ 313,000,000 $ 334,000,000 $ 334,000,000
Plan assets at fair value in the fair value hierarchy   $ 9,000,000 $ 11,000,000 $ 11,000,000
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   5.59% 5.14% 5.40%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   $ (12,000,000) $ (7,000,000)  
Cash Balance Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation   332,000,000 357,000,000  
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   5.65% 5.15% 5.43%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   $ (145,000,000) $ (88,000,000)  
UNITED STATES | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.65% 5.15% 5.43%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets   5.90% 6.10% 5.10%
Defined Benefit Plan, Benefit Obligation   $ 3,075,000,000 $ 3,269,000,000 $ 3,156,000,000
Plan assets at fair value in the fair value hierarchy   $ 3,387,000,000 $ 3,562,000,000 $ 3,513,000,000