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Schedule III Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs $ 1,113 $ 998      
Unpaid Losses and Loss Adjustment Expenses 42,318 41,243      
Reserve for Future Policy Benefits 484 502 $ 646 $ 723 $ 638
Unearned Premiums 8,599 7,815      
Other Policyholder Funds and Benefits Payable 638 658      
Earned Premiums, Fee Income and Other 22,410 20,812 19,568    
Net Investment Income 2,305 2,177 2,313    
Benefits, Losses and Loss Adjustment Expenses 14,238 13,138 12,720    
Amortization of Deferred Policy Acquisition Costs 2,044 1,824 1,668    
Insurance Operating Costs and Other Expenses 5,157 5,138 5,097    
Net Written Premiums 15,477 14,119 12,949    
Operating Segments | P&C Commercial Lines          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 976 865      
Unpaid Losses and Loss Adjustment Expenses 29,181 28,454      
Reserve for Future Policy Benefits 0 0      
Unearned Premiums 6,977 6,306      
Other Policyholder Funds and Benefits Payable 0 0      
Earned Premiums, Fee Income and Other 11,683 10,609 9,586    
Net Investment Income 1,532 1,415 1,502    
Benefits, Losses and Loss Adjustment Expenses 6,786 6,169 6,044    
Amortization of Deferred Policy Acquisition Costs 1,779 1,563 1,398    
Insurance Operating Costs and Other Expenses 1,907 1,857 1,747    
Net Written Premiums 12,279 11,158 10,041    
Operating Segments | P&C Personal Lines          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 102 101      
Unpaid Losses and Loss Adjustment Expenses 2,068 1,857      
Reserve for Future Policy Benefits 0 0      
Unearned Premiums 1,582 1,471      
Other Policyholder Funds and Benefits Payable 0 0      
Earned Premiums, Fee Income and Other 3,198 3,052 3,066    
Net Investment Income 171 140 157    
Benefits, Losses and Loss Adjustment Expenses 2,538 2,164 1,864    
Amortization of Deferred Policy Acquisition Costs 231 228 230    
Insurance Operating Costs and Other Expenses 638 652 678    
Net Written Premiums 3,198 2,961 2,908    
Operating Segments | Property & Casualty Other Operations          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 0 0      
Unpaid Losses and Loss Adjustment Expenses 2,795 2,772      
Reserve for Future Policy Benefits 0 0      
Unearned Premiums 2 2      
Other Policyholder Funds and Benefits Payable 0 0      
Earned Premiums, Fee Income and Other 0 0 0    
Net Investment Income 69 63 75    
Benefits, Losses and Loss Adjustment Expenses 224 280 202    
Amortization of Deferred Policy Acquisition Costs 0 0 0    
Insurance Operating Costs and Other Expenses 4 9 9    
Net Written Premiums 0 0 0    
Operating Segments | Group Benefits [Member]          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 35 32      
Unpaid Losses and Loss Adjustment Expenses 8,274 8,160      
Reserve for Future Policy Benefits 312 319      
Unearned Premiums 38 36      
Other Policyholder Funds and Benefits Payable 408 419      
Earned Premiums, Fee Income and Other 6,515 6,057 5,687    
Net Investment Income 469 524 550    
Benefits, Losses and Loss Adjustment Expenses 4,683 4,517 4,602    
Amortization of Deferred Policy Acquisition Costs 34 33 40    
Insurance Operating Costs and Other Expenses 1,554 1,507 1,413    
Net Written Premiums 0 0 0    
Operating Segments | Hartford Funds          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 0 0      
Unpaid Losses and Loss Adjustment Expenses 0 0      
Reserve for Future Policy Benefits 0 0      
Unearned Premiums 0 0      
Other Policyholder Funds and Benefits Payable 0 0      
Earned Premiums, Fee Income and Other 973 1,044 1,189    
Net Investment Income 17 9 5    
Benefits, Losses and Loss Adjustment Expenses 0 0 0    
Amortization of Deferred Policy Acquisition Costs 0 0 0    
Insurance Operating Costs and Other Expenses 781 826 925    
Net Written Premiums 0 0 0    
Corporate          
Schedule of Supplementary Insurance Information [Abstract]          
Deferred Policy Acquisition Costs 0 0      
Unpaid Losses and Loss Adjustment Expenses 0 0      
Reserve for Future Policy Benefits 172 183      
Unearned Premiums 0 0      
Other Policyholder Funds and Benefits Payable 230 239      
Earned Premiums, Fee Income and Other 41 50 40    
Net Investment Income 47 26 24    
Benefits, Losses and Loss Adjustment Expenses 7 8 8    
Amortization of Deferred Policy Acquisition Costs 0 0 0    
Insurance Operating Costs and Other Expenses 273 287 325    
Net Written Premiums $ 0 $ 0 $ 0