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Debt - Additional Information (Details)
£ in Millions
 1 Months Ended 12 Months Ended
Jun. 17, 2019
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
GBP (£)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
GBP (£)
Sep. 21, 2021
USD ($)
Dec. 17, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
GBP (£)
Mar. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Aug. 19, 2019
USD ($)
May 23, 2019
USD ($)
Jan. 15, 2019
USD ($)
Debt Instrument [Line Items]                                
Interest Expense   $ 234,000,000 $ 236,000,000 $ 259,000,000                        
Registration Payment Arrangement, Term three                              
Proceeds from Debt, Net of Issuance Costs       1,380,000,000                        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00%                            
Gain (Loss) on Extinguishment of Debt   $ 0 $ 0 $ 90,000,000                        
Debt Instrument, Payment Terms   The Company has the right to defer interest payments for up to a consecutive ten years without giving rise to an event of default. Deferred interest will continue to accrue and will accrue additional interest at the then applicable interest rate. If the Company defers interest payments, the Company generally may not make payments on or redeem or purchase any shares of its capital stock or any of its debt securities or guarantees that rank upon liquidation, dissolution or winding up equally with or junior to the debentures, subject to certain limited exceptions.                            
Line of Credit Facility, Description   In 2018, The Hartford entered into a $750 senior unsecured five-year revolving credit facility (the "Credit Facility"), with an expiration date of March 29, 2023. On October 27, 2021, The Hartford amended and restated the Credit Facility (as amended, the “2021 Credit Facility”) which, among other changes, extends the term of the facility through October 27, 2026, includes provisions for determining LIBOR successor rates, and resets the level of The Hartford’s minimum consolidated net worth financial covenant to $11.25 billion, excluding AOCI. The 2021 Credit Facility provides up to $750 of unsecured credit, including $100 available to support letters of credit. Under the 2021 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 2021 Credit Facility limits the ratio of senior debt to capitalization, excluding AOCI, at 35% and includes other customary covenants. The 2021 Credit Facility is for general corporate purposes.                            
Line of Credit Facility, Borrowing Capacity, Description   In 2018, The Hartford entered into a $750 senior unsecured five-year revolving credit facility (the "Credit Facility"), with an expiration date of March 29, 2023. On October 27, 2021, The Hartford amended and restated the Credit Facility (as amended, the “2021 Credit Facility”) which, among other changes, extends the term of the facility through October 27, 2026, includes provisions for determining LIBOR successor rates, and resets the level of The Hartford’s minimum consolidated net worth financial covenant to $11.25 billion, excluding AOCI. The 2021 Credit Facility provides up to $750 of unsecured credit, including $100 available to support letters of credit. Under the 2021 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 2021 Credit Facility limits the ratio of senior debt to capitalization, excluding AOCI, at 35% and includes other customary covenants. The 2021 Credit Facility is for general corporate purposes.                            
Line of Credit Facility, Fair Value of Amount Outstanding   $ 0                            
Proceeds from Lines of Credit   0                            
Credit facility                 $ 750,000,000              
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding   0                            
Maximum | Hartford Fire Insurance Company [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Collateral Amount   1,300,000,000                            
Maximum | Hartford Life and Accident Insurance Company [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Collateral Amount   600,000,000                            
Club Facility [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount                   $ 165,000,000            
Letters of Credit Outstanding, Amount           $ 78,000,000         £ 60          
Club Facility [Member] | Tranche One [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount   104,000,000                            
Letters of Credit Outstanding, Amount   104,000,000                            
Club Facility [Member] | Tranche Two [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount   115,000,000     £ 85                      
Letters of Credit Outstanding, Amount   92,000,000     £ 68                      
Bilateral Facility [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount   25,000,000       25,000,000                    
Letters of Credit Outstanding, Amount   $ 0       $ 23,000,000 £ 18                  
Senior Note Six Point One Percent Due in Two Thousand Forty One [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Interest Rate, Effective Percentage   7.90%     7.90%                      
Debt Instrument, Interest Rate, Stated Percentage   6.10%     6.10%                      
Senior Note Two Point Nine Percent Due In Twenty Fifty One                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount               $ 600,000,000                
Proceeds from Debt, Net of Issuance Costs   $ 588,000,000                            
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00%                            
Debt Instrument, Interest Rate, Increase (Decrease)   20.00%                            
Senior Note Five Point Five Percent Due in Two Thousand Twenty [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Interest Rate, Stated Percentage     550.00%                          
Senior Note Five Point Five Percent Due in Two Thousand Twenty [Member] | Senior Notes                                
Debt Instrument [Line Items]                                
Debt repaid                       $ 500,000,000        
Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] | Senior Notes                                
Debt Instrument [Line Items]                                
Debt repaid                               $ 413,000,000
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member]                                
Debt Instrument [Line Items]                                
Debt repaid                         $ 265,000,000      
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] | Par Value [Member]                                
Debt Instrument [Line Items]                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                             $ 265,000,000  
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] | Fair Value [Member]                                
Debt Instrument [Line Items]                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                             $ 284,000,000  
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Interest Rate, Increase (Decrease)   20.00%                            
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] | Senior Notes                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount                           $ 600,000,000    
Senior Note Three Point Six due in Two Thousand Forty Nine [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument, Interest Rate, Increase (Decrease)   25.00%                            
Senior Note Three Point Six due in Two Thousand Forty Nine [Member] | Senior Notes                                
Debt Instrument [Line Items]                                
Debt Instrument, Face Amount                           $ 800,000,000    
Senior Note Five Point One Twenty Five due in Two Thousand Twenty Two [Member]                                
Debt Instrument [Line Items]                                
Debt repaid                         $ 800