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Schedule III Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs $ 1,239 $ 1,113  
Unpaid Losses and Loss Adjustment Expenses 44,610 42,318  
Reserve for Future Policy Benefits 448 484 $ 502
Unearned Premiums 9,408 8,599  
Other Policyholder Funds and Benefits Payable 614 638  
Earned Premiums, Fee Income and Other 24,028 22,410 20,812
Net Investment Income 2,568 2,305 2,177
Benefits, Losses and Loss Adjustment Expenses 14,874 14,238 13,138
Amortization of Deferred Policy Acquisition Costs 2,282 2,044 1,824
Insurance Operating Costs and Other Expenses 5,530 5,157 5,138
Net Written Premiums 16,949 15,477 14,119
Operating Segments      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 1,239 1,113  
Unpaid Losses and Loss Adjustment Expenses 44,610 42,318  
Reserve for Future Policy Benefits 290 312  
Unearned Premiums 9,408 8,599  
Other Policyholder Funds and Benefits Payable 401 408  
Earned Premiums, Fee Income and Other 23,986 22,369 20,762
Net Investment Income 2,505 2,258 2,151
Benefits, Losses and Loss Adjustment Expenses 14,866 14,231 13,130
Amortization of Deferred Policy Acquisition Costs 2,282 2,044 1,824
Insurance Operating Costs and Other Expenses 5,275 4,884 4,851
Net Written Premiums 16,949 15,477 14,119
Operating Segments | P&C Business Insurance [Member]      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 1,093 976  
Unpaid Losses and Loss Adjustment Expenses 31,381 29,181  
Reserve for Future Policy Benefits 0 0  
Unearned Premiums 7,638 6,977  
Other Policyholder Funds and Benefits Payable 0 0  
Earned Premiums, Fee Income and Other 12,765 11,683 10,609
Net Investment Income 1,714 1,532 1,415
Benefits, Losses and Loss Adjustment Expenses 7,441 6,786 6,169
Amortization of Deferred Policy Acquisition Costs 1,993 1,779 1,563
Insurance Operating Costs and Other Expenses 2,047 1,907 1,857
Net Written Premiums 13,351 12,279 11,158
Operating Segments | P&C Personal Insurance [Member]      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 113 102  
Unpaid Losses and Loss Adjustment Expenses 2,239 2,068  
Reserve for Future Policy Benefits 0 0  
Unearned Premiums 1,728 1,582  
Other Policyholder Funds and Benefits Payable 0 0  
Earned Premiums, Fee Income and Other 3,571 3,198 3,052
Net Investment Income 222 171 140
Benefits, Losses and Loss Adjustment Expenses 2,525 2,538 2,164
Amortization of Deferred Policy Acquisition Costs 255 231 228
Insurance Operating Costs and Other Expenses 742 638 652
Net Written Premiums 3,598 3,198 2,961
Operating Segments | Property & Casualty Other Operations [Member]      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 0 0  
Unpaid Losses and Loss Adjustment Expenses 2,784 2,795  
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 74 69 63
Benefits, Losses and Loss Adjustment Expenses 219 224 280
Amortization of Deferred Policy Acquisition Costs 0 0 0
Insurance Operating Costs and Other Expenses 13 4 9
Net Written Premiums 0 0 0
Operating Segments | Employee Benefits [Member]      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 33 35  
Unpaid Losses and Loss Adjustment Expenses 8,206 8,274  
Reserve for Future Policy Benefits 290 312  
Unearned Premiums 40 38  
Other Policyholder Funds and Benefits Payable 401 408  
Earned Premiums, Fee Income and Other 6,615 6,515 6,057
Net Investment Income 475 469 524
Benefits, Losses and Loss Adjustment Expenses 4,681 4,683 4,517
Amortization of Deferred Policy Acquisition Costs 34 34 33
Insurance Operating Costs and Other Expenses 1,649 1,554 1,507
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 1,035 973 1,044
Net Investment Income 20 17 9
Benefits, Losses and Loss Adjustment Expenses 0 0 0
Amortization of Deferred Policy Acquisition Costs 0 0 0
Insurance Operating Costs and Other Expenses 824 781 826
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 158 172  
Unearned Premiums 0 0  
Other Policyholder Funds and Benefits Payable 213 230  
Earned Premiums, Fee Income and Other 42 41 50
Net Investment Income 63 47 26
Benefits, Losses and Loss Adjustment Expenses 8 7 8
Amortization of Deferred Policy Acquisition Costs 0 0 0
Insurance Operating Costs and Other Expenses 255 273 287
Net Written Premiums $ 0 $ 0 $ 0