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Schedule III Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | $ 789 | $ 785 |  |
Unpaid Losses and Loss Adjustment Expenses | 37,855 | 36,517 |  |
Reserve for Future Policy Benefits | 638 | 635 |  |
Unearned Premiums | 6,629 | 6,635 |  |
Other Policyholder Funds and Benefits Payable | 701 | 755 |  |
Earned Premiums, Fee Income and Other | 18,691 | 18,394 | $ 17,287 |
Net Investment Income | 1,846 | 1,951 | 1,780 |
Benefits, Losses and Loss Adjustment Expenses | 11,805 | 11,472 | 11,165 |
Amortization of Deferred Policy Acquisition Costs | 1,706 | 1,622 | 1,384 |
Insurance Operating Costs and Other Expenses | 4,892 | 5,086 | 4,653 |
Net Written Premiums | 11,914 | 11,595 | 10,408 |
Group Insurance Policy [Member] |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Unpaid Losses and Loss Adjustment Expenses | 8,233 | 8,256 | 8,445 | $ 8,512
Operating Segments | Property and Casualty, Commercial Insurance [Member] |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | 641 | 615 |  |
Unpaid Losses and Loss Adjustment Expenses | 25,058 | 23,363 |  |
Reserve for Future Policy Benefits | 0 | 0 |  |
Unearned Premiums | 5,081 | 5,015 |  |
Other Policyholder Funds and Benefits Payable | 0 | 0 |  |
Earned Premiums, Fee Income and Other | 8,941 | 8,326 | 7,081 |
Net Investment Income | 1,160 | 1,129 | 997 |
Benefits, Losses and Loss Adjustment Expenses | 5,929 | 5,192 | 4,112 |
Amortization of Deferred Policy Acquisition Costs | 1,397 | 1,296 | 1,048 |
Insurance Operating Costs and Other Expenses | 1,683 | 1,776 | 1,396 |
Net Written Premiums | 8,969 | 8,452 | 7,136 |
Operating Segments | Property and Casualty, Personal Insurance [Member] |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | 103 | 111 |  |
Unpaid Losses and Loss Adjustment Expenses | 1,836 | 2,201 |  |
Reserve for Future Policy Benefits | 0 | 0 |  |
Unearned Premiums | 1,506 | 1,578 |  |
Other Policyholder Funds and Benefits Payable | 0 | 0 |  |
Earned Premiums, Fee Income and Other | 3,123 | 3,318 | 3,523 |
Net Investment Income | 157 | 179 | 155 |
Benefits, Losses and Loss Adjustment Expenses | 1,466 | 2,185 | 2,763 |
Amortization of Deferred Policy Acquisition Costs | 244 | 259 | 275 |
Insurance Operating Costs and Other Expenses | 663 | 702 | 684 |
Net Written Premiums | 2,936 | 3,131 | 3,276 |
Operating Segments | Property & Casualty Other Operations |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | 0 | 0 |  |
Unpaid Losses and Loss Adjustment Expenses | 2,728 | 2,697 |  |
Reserve for Future Policy Benefits | 0 | 0 |  |
Unearned Premiums | 2 | 3 |  |
Other Policyholder Funds and Benefits Payable | 0 | 0 |  |
Earned Premiums, Fee Income and Other | 0 | 2 | 0 |
Net Investment Income | 55 | 84 | 90 |
Benefits, Losses and Loss Adjustment Expenses | 258 | 21 | 65 |
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 0 |
Insurance Operating Costs and Other Expenses | 10 | 12 | 13 |
Net Written Premiums | 0 | 0 | 4 |
Operating Segments | Group Insurance Policy [Member] |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | 38 | 51 |  |
Unpaid Losses and Loss Adjustment Expenses | 8,233 | 8,256 |  |
Reserve for Future Policy Benefits | 420 | 411 |  |
Unearned Premiums | 40 | 39 |  |
Other Policyholder Funds and Benefits Payable | 415 | 459 |  |
Earned Premiums, Fee Income and Other | 5,536 | 5,603 | 5,598 |
Net Investment Income | 448 | 486 | 474 |
Benefits, Losses and Loss Adjustment Expenses | 4,137 | 4,055 | 4,214 |
Amortization of Deferred Policy Acquisition Costs | 50 | 54 | 45 |
Insurance Operating Costs and Other Expenses | 1,348 | 1,352 | 1,342 |
Net Written Premiums | 0 | 0 | 0 |
Operating Segments | Hartford Funds |  |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |  |
Deferred Policy Acquisition Costs | 7 | 8 |  |
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 | 989 | 999 | 1,032 |
Net Investment Income | 4 | 7 | 5 |
Benefits, Losses and Loss Adjustment Expenses | 0 | 0 | 0 |
Amortization of Deferred Policy Acquisition Costs | 14 | 12 | 16 |
Insurance Operating Costs and Other Expenses | 773 | 813 | 831 |
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 | 218 | 224 |  |
Unearned Premiums | 0 | 0 |  |
Other Policyholder Funds and Benefits Payable | 286 | 296 |  |
Earned Premiums, Fee Income and Other | 102 | 146 | 53 |
Net Investment Income | 22 | 66 | 59 |
Benefits, Losses and Loss Adjustment Expenses | 15 | 19 | 11 |
Amortization of Deferred Policy Acquisition Costs | 1 | 1 | 0 |
Insurance Operating Costs and Other Expenses | 415 | 431 | 387 |
Net Written Premiums | $ 9 | $ 12 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://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 http://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 http://asc.fasb.org/extlink&oid=121643868&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 http://asc.fasb.org/extlink&oid=121639165&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 http://asc.fasb.org/extlink&oid=120400017&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 http://asc.fasb.org/extlink&oid=121370832&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 http://asc.fasb.org/extlink&oid=121643868&loc=d3e14931-158439 + Details
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