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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

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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