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Schedule III Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 650 | $ 645 |
Unpaid Losses and Loss Adjustment Expenses | 32,287 | 28,317 |
Reserve for Future Policy Benefits | 713 | 322 |
Unearned Premiums | 5,322 | 5,392 |
Other Policyholder Funds and Benefits Payable | 816 | 602 |
Earned Premiums, Fee Income and Other | 15,206 | 14,640 | $ 14,448
Net Investment Income (Loss) | 1,603 | 1,577 | 1,561
Benefits, Losses and Loss Adjustment Expenses | 10,174 | 9,961 | 9,324
Amortization of Deferred Policy Acquisition Costs | 1,372 | 1,377 | 1,364
Insurance Operating Costs and Other Expenses | 4,705 | 4,322 | 3,831
Net Written Premiums | 10,517 | 10,568 | 10,578
Operating Segments | Commercial Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 467 | 448 |
Unpaid Losses and Loss Adjustment Expenses | 18,893 | 17,950 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 3,504 | 3,441 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 6,902 | 6,690 | 6,551
Net Investment Income (Loss) | 949 | 917 | 910
Benefits, Losses and Loss Adjustment Expenses | 4,322 | 3,994 | 3,886
Amortization of Deferred Policy Acquisition Costs | 1,009 | 973 | 951
Insurance Operating Costs and Other Expenses | 1,381 | 1,244 | 1,232
Net Written Premiums | 6,956 | 6,732 | 6,625
Operating Segments | Personal Lines |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 127 | 143 |
Unpaid Losses and Loss Adjustment Expenses | 2,294 | 2,094 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 1,768 | 1,898 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 3,819 | 4,023 | 3,997
Net Investment Income (Loss) | 141 | 135 | 128
Benefits, Losses and Loss Adjustment Expenses | 3,000 | 3,175 | 2,768
Amortization of Deferred Policy Acquisition Costs | 309 | 348 | 359
Insurance Operating Costs and Other Expenses | 649 | 669 | 714
Net Written Premiums | 3,561 | 3,837 | 3,918
Operating Segments | Property & Casualty Other Operations |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 0 | 0 |
Unpaid Losses and Loss Adjustment Expenses | 2,588 | 2,501 |
Reserve for Future Policy Benefits | 0 | 0 |
Unearned Premiums | 10 | 11 |
Other Policyholder Funds and Benefits Payable | 0 | 0 |
Earned Premiums, Fee Income and Other | 0 | 0 | 32
Net Investment Income (Loss) | 106 | 127 | 133
Benefits, Losses and Loss Adjustment Expenses | 18 | 278 | 243
Amortization of Deferred Policy Acquisition Costs | 0 | 0 | 0
Insurance Operating Costs and Other Expenses | 9 | 663 | 25
Net Written Premiums | 0 | (1) | 35
Operating Segments | Group Benefits |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 47 | 42 |
Unpaid Losses and Loss Adjustment Expenses | 8,512 | 5,772 |
Reserve for Future Policy Benefits | 441 | 82 |
Unearned Premiums | 40 | 42 |
Other Policyholder Funds and Benefits Payable | 492 | 265 |
Earned Premiums, Fee Income and Other | 3,677 | 3,223 | 3,136
Net Investment Income (Loss) | 381 | 366 | 371
Benefits, Losses and Loss Adjustment Expenses | 2,803 | 2,514 | 2,427
Amortization of Deferred Policy Acquisition Costs | 33 | 31 | 31
Insurance Operating Costs and Other Expenses | 924 | 776 | 788
Net Written Premiums | 0 | 0 | 0
Operating Segments | Mutual Funds |  |  |
Schedule of Supplementary Insurance Information [Abstract] |  |  |
Deferred Policy Acquisition Costs | 9 | 12 |
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 | 804 | 701 | 723
Net Investment Income (Loss) | 3 | 1 | 1
Benefits, Losses and Loss Adjustment Expenses | 0 | 0 | 0
Amortization of Deferred Policy Acquisition Costs | 21 | 24 | 22
Insurance Operating Costs and Other Expenses | 617 | 557 | 568
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 | 272 | 240 |
Unearned Premiums | 0 | 0 |
Other Policyholder Funds and Benefits Payable | 324 | 337 |
Earned Premiums, Fee Income and Other | 4 | 3 | 9
Net Investment Income (Loss) | 23 | 31 | 18
Benefits, Losses and Loss Adjustment Expenses | 31 | 0 | 0
Amortization of Deferred Policy Acquisition Costs | 0 | 1 | 1
Insurance Operating Costs and Other Expenses | 1,125 | 413 | 504
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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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