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Debt - Additional Information (Details)
£ in Millions
 1 Months Ended 12 Months Ended
Jun. 17, 2019
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 17, 2020
USD ($)
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   $ 236,000,000 $ 259,000,000 $ 298,000,000                  
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 $ 90,000,000 $ 6,000,000                  
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   The Company has a senior unsecured five-year revolving credit facility (“Credit Facility”) that provides up to $750 of unsecured credit through March 29, 2023. Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth, excluding AOCI, of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The Credit Facility is for general corporate purposes.                      
Line of Credit Facility, Borrowing Capacity, Description   The Company has a senior unsecured five-year revolving credit facility (“Credit Facility”) that provides up to $750 of unsecured credit through March 29, 2023. Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth, excluding AOCI, of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The 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   1,200,000,000                      
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   116,000,000     £ 85                
Letters of Credit Outstanding, Amount   116,000,000     £ 85                
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%                
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