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Debt - Additional Information (Details)
£ in Millions, $ in Millions
 12 Months Ended
Feb. 22, 2022
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Sep. 21, 2021
USD ($)
Debt Instrument [Line Items]              
Registration Payment Arrangement, Term three-year            
Line of Credit Facility, Description   The Hartford has a $750 senior unsecured revolving credit facility, including $100 available to support letters of credit (the "Credit Facility"), 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. •Letters of credit bear a fee based on The Hartford's credit rating and expire no later than October 27, 2027. 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. The Credit Facility is for general corporate purposes.          
Line of Credit Facility, Borrowing Capacity, Description   The Hartford has a $750 senior unsecured revolving credit facility, including $100 available to support letters of credit (the "Credit Facility"), 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. •Letters of credit bear a fee based on The Hartford's credit rating and expire no later than October 27, 2027. 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. The Credit Facility is for general corporate purposes.          
Line of Credit Facility, Fair Value of Amount Outstanding   $ 0 $ 0        
Proceeds from Lines of Credit   0 0        
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding   0 0        
Maximum | Hartford Fire Insurance Company [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount   1,300          
Maximum | Hartford Life and Accident Insurance Company [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount   700          
Letter of Credit | Tranche One [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   74          
Letters of Credit Outstanding, Amount     74        
Letter of Credit | Tranche Two [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 101     £ 79    
Letters of Credit Outstanding, Amount     $ 95     £ 79  
Senior Note Two Point Nine Percent Due In Twenty Fifty One              
Debt Instrument [Line Items]              
Proceeds from Debt, Net of Issuance Costs       $ 588      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00%          
Debt Instrument, Interest Rate, Increase (Decrease)   20.00%          
Debt Instrument, Face Amount             $ 600