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Schedule III Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 670 | $ 650 |
Unpaid Losses and Loss Adjustment Expenses | 33,029 | 32,287 |
Reserve for Future Policy Benefits | 642 | 713 |
Unearned Premiums | 5,282 | 5,322 |
Other Policyholder Funds and Benefits Payable | 767 | 816 |
Earned Premiums, Fee Income and Other | 17,287 | 15,394 | $ 14,824
Net Investment Income | 1,780 | 1,603 | 1,577
Benefits, Losses and Loss Adjustment Expenses | 11,165 | 10,174 | 9,961
Amortization of Deferred Policy Acquisition Costs | 1,384 | 1,372 | 1,377
Insurance Operating Costs and Other Expenses | 4,653 | 4,893 | 4,506
Net Written Premiums | 10,408 | 10,517 | 10,568
Operating Segments | Commercial Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 495 | 467 |
Unpaid Losses and Loss Adjustment Expenses | 19,455 | 18,893 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 3,589 | 3,504 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 7,081 | 6,902 | 6,690
Net Investment Income | 997 | 949 | 917
Benefits, Losses and Loss Adjustment Expenses | 4,112 | 4,322 | 3,994
Amortization of Deferred Policy Acquisition Costs | 1,048 | 1,009 | 973
Insurance Operating Costs and Other Expenses | 1,396 | 1,381 | 1,244
Net Written Premiums | 7,136 | 6,956 | 6,732
Operating Segments | Personal Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 117 | 127 |
Unpaid Losses and Loss Adjustment Expenses | 2,456 | 2,294 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 1,643 | 1,768 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 3,523 | 3,819 | 4,023
Net Investment Income | 155 | 141 | 135
Benefits, Losses and Loss Adjustment Expenses | 2,763 | 3,000 | 3,175
Amortization of Deferred Policy Acquisition Costs | 275 | 309 | 348
Insurance Operating Costs and Other Expenses | 684 | 649 | 669
Net Written Premiums | 3,276 | 3,561 | 3,837
Operating Segments | Property & Casualty Other Operations |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 |
Unpaid Losses and Loss Adjustment Expenses | 2,673 | 2,588 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 7 | 10 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 0 | 0 | 0
Net Investment Income | 90 | 106 | 127
Benefits, Losses and Loss Adjustment Expenses | 65 | 18 | 278
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 0
Insurance Operating Costs and Other Expenses | 13 | 9 | 663
Net Written Premiums | (4) | 0 | (1)
Operating Segments | Group Benefits |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 52 | 47 |
Unpaid Losses and Loss Adjustment Expenses | 8,445 | 8,512 |
Reserve for Future Policy Benefits | 427 | 441 |
Unearned Premiums | 43 | 40 |
Other Policyholder Funds and Benefits Payable | 455 | 492 |
Earned Premiums, Fee Income and Other | 5,598 | 3,677 | 3,223
Net Investment Income | 474 | 381 | 366
Benefits, Losses and Loss Adjustment Expenses | 4,214 | 2,803 | 2,514
Amortization of Deferred Policy Acquisition Costs | 45 | 33 | 31
Insurance Operating Costs and Other Expenses | 1,342 | 924 | 776
Net Written Premiums | 0 | 0 | 0
Operating Segments | Hartford Funds |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 6 | 9 |
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 | 1,032 | 992 | 885
Net Investment Income | 5 | 3 | 1
Benefits, Losses and Loss Adjustment Expenses | 0 | 0 | 0
Amortization of Deferred Policy Acquisition Costs | 16 | 21 | 24
Insurance Operating Costs and Other Expenses | 831 | 805 | 741
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 | 215 | 272 |
Unearned Premiums | 0 | 0 |
Other Policyholder Funds and Benefits Payable | 312 | 324 |
Earned Premiums, Fee Income and Other | 53 | 4 | 3
Net Investment Income | 59 | 23 | 31
Benefits, Losses and Loss Adjustment Expenses | 11 | 31 | 0
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 1
Insurance Operating Costs and Other Expenses | 387 | 1,125 | 413
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://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=99382578&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=99382578&loc=d3e14764-158437 + Details
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