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Schedule III Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 1,002 | $ 881 |
Unpaid Losses and Loss Adjustment Expenses | 41,243 | 39,659 |
Reserve for Future Policy Benefits | 561 | 596 | $ 638
Unearned Premiums | 7,815 | 7,194 |
Other Policyholder Funds and Benefits Payable | 658 | 687 |
Earned Premiums, Fee Income and Other | 20,812 | 19,568 | 18,691
Net Investment Income | 2,177 | 2,313 | 1,846
Benefits, Losses and Loss Adjustment Expenses | 13,142 | 12,729 | 11,805
Amortization of Deferred Policy Acquisition Costs | 1,835 | 1,680 | 1,706
Insurance Operating Costs and Other Expenses | 5,127 | 5,085 | 4,892
Net Written Premiums | 14,119 | 12,949 | 11,914
Operating Segments | P&C Commercial Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 865 | 742 |
Unpaid Losses and Loss Adjustment Expenses | 28,454 | 26,906 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 6,306 | 5,693 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 10,609 | 9,586 | 8,941
Net Investment Income | 1,415 | 1,502 | 1,160
Benefits, Losses and Loss Adjustment Expenses | 6,169 | 6,044 | 5,929
Amortization of Deferred Policy Acquisition Costs | 1,563 | 1,398 | 1,397
Insurance Operating Costs and Other Expenses | 1,857 | 1,747 | 1,683
Net Written Premiums | 11,158 | 10,041 | 8,969
Operating Segments | P&C Personal Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 101 | 101 |
Unpaid Losses and Loss Adjustment Expenses | 1,857 | 1,844 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 1,471 | 1,459 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 3,052 | 3,066 | 3,123
Net Investment Income | 140 | 157 | 157
Benefits, Losses and Loss Adjustment Expenses | 2,164 | 1,864 | 1,466
Amortization of Deferred Policy Acquisition Costs | 228 | 230 | 244
Insurance Operating Costs and Other Expenses | 652 | 678 | 663
Net Written Premiums | 2,961 | 2,908 | 2,936
Operating Segments | Property & Casualty Other Operations |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 |
Unpaid Losses and Loss Adjustment Expenses | 2,772 | 2,699 |
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 | 63 | 75 | 55
Benefits, Losses and Loss Adjustment Expenses | 280 | 202 | 258
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 0
Insurance Operating Costs and Other Expenses | 9 | 9 | 10
Net Written Premiums | 0 | 0 | 0
Operating Segments | Group Benefits [Member] |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 32 | 31 |
Unpaid Losses and Loss Adjustment Expenses | 8,160 | 8,210 |
Reserve for Future Policy Benefits | 380 | 399 |
Unearned Premiums | 36 | 40 |
Other Policyholder Funds and Benefits Payable | 419 | 426 |
Earned Premiums, Fee Income and Other | 6,057 | 5,687 | 5,536
Net Investment Income | 524 | 550 | 448
Benefits, Losses and Loss Adjustment Expenses | 4,520 | 4,612 | 4,137
Amortization of Deferred Policy Acquisition Costs | 33 | 40 | 50
Insurance Operating Costs and Other Expenses | 1,507 | 1,413 | 1,348
Net Written Premiums | 0 | 0 | 0
Operating Segments | Hartford Funds |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 4 | 7 |
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 | 1,044 | 1,189 | 989
Net Investment Income | 9 | 5 | 4
Benefits, Losses and Loss Adjustment Expenses | 0 | 0 | 0
Amortization of Deferred Policy Acquisition Costs | 11 | 12 | 14
Insurance Operating Costs and Other Expenses | 815 | 913 | 773
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 | 181 | 197 |
Unearned Premiums | 0 | 0 |
Other Policyholder Funds and Benefits Payable | 239 | 261 |
Earned Premiums, Fee Income and Other | 50 | 40 | 102
Net Investment Income | 26 | 24 | 22
Benefits, Losses and Loss Adjustment Expenses | 9 | 7 | 15
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 1
Insurance Operating Costs and Other Expenses | 287 | 325 | 415
Net Written Premiums | $ 0 | $ 0 | $ 9

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)(1)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 + Details
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