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Debt - Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 24, 2025
Sep. 30, 2025
Dec. 31, 2024
Oct. 01, 2025
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding   $ 0 $ 0  
Maximum | Hartford Fire Insurance Company        
Debt Instrument [Line Items]        
Debt Instrument, Collateral Amount   1,400    
Maximum | Hartford Fire Insurance Company | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Collateral Amount       $ 2,000
Maximum | Hartford Life and Accident Insurance Company        
Debt Instrument [Line Items]        
Debt Instrument, Collateral Amount   600    
Maximum | Hartford Life and Accident Insurance Company | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Collateral Amount       $ 2,000
Revolving Credit Facility | Credit Facility        
Debt Disclosure [Abstract]        
Line of Credit Facility, Maximum Borrowing Capacity   750    
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   750    
Line of Credit Facility, Covenant Terms The Credit Facility requires the Company to maintain a minimum consolidated net worth financial covenant to $12.7 billion, excluding AOCI, limits the ratio of senior debt to capitalization, excluding AOCI, at 35% and includes other customary covenants.      
Long-Term Line of Credit   $ 0 $ 0  
Line of Credit Facility, Covenant Compliance   in compliance in compliance  
Line of Credit Facility, Description extends the term of the facility through September 24, 2030. Under the Credit Facility:•Revolving loans may be in multiple currencies.•U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate plus a basis point spread based on The Hartford's credit rating and will mature no later than September 24, 2030.      
Letter of Credit | Credit Facility        
Debt Disclosure [Abstract]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 100    
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   100    
Letters of Credit Outstanding, Amount   $ 0 $ 0  
Line of Credit Facility, Description Letters of credit bear a fee based on The Hartford's credit rating and expire no later than September 24, 2031.