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Debt - Additional Information (Details)
£ in Millions, $ in Millions
 12 Months Ended
Feb. 22, 2022
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
GBP (£)
Oct. 21, 2024
USD ($)
Oct. 21, 2024
GBP (£)
Dec. 31, 2023
GBP (£)
Debt Instrument [Line Items]              
Registration Payment Arrangement, Term three-year            
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding   $ 0 $ 0        
Revolving Credit Facilities   0 0        
Maximum | Hartford Fire Insurance Company [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount   1,400          
Maximum | Hartford Life and Accident Insurance Company [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount   600          
Letter of Credit | Credit Facility [Member]              
Debt Instrument [Line Items]              
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 October 27, 2027          
Line of Credit Facility, Maximum Borrowing Capacity   $ 100          
Revolving Credit Facility | Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Covenant Compliance   in compliance in compliance        
Line of Credit Facility, Covenant Terms   The Credit Facility requires the Company to maintain a minimum consolidated net worth financial covenant to $11.25 billion, excluding AOCI, limits the ratio of senior debt to capitalization, excluding AOCI, at 35% and includes other customary covenants.          
Line of Credit Facility, Description   with an expiration date of October 27, 2026. 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 that varies depending on the type of borrowing plus a basis point spread based on The Hartford's credit rating and will mature no later than October 27, 2026.          
Line of Credit Facility, Maximum Borrowing Capacity   $ 750          
Revolving Credit Facilities   0 $ 0        
Tranche One [Member] | Letter of Credit | Lloyd's Facility              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 74    
Letters of Credit Outstanding, Amount   74 74        
Tranche Two [Member] | Letter of Credit | Lloyd's Facility              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   99       £ 79  
Letters of Credit Outstanding, Amount   $ 99 $ 101 £ 79     £ 79