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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 4,331 | $ 3,738 | $ 12,866 | $ 11,195
Net investment income | 444 | 404 | 1,323 | 1,209
Realized Investment Gains (Losses) | 38 | 26 | 60 | 105
Other revenues | 29 | 24 | 73 | 66
Total revenues | 4,842 | 4,192 | 14,322 | 12,575
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 1,794 | 1,732 | 5,267 | 5,159
Property and Casualty, Commercial Insurance Product Line [Member] | Workers’ compensation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 845 | 828 | 2,495 | 2,461
Property and Casualty, Commercial Insurance Product Line [Member] | Liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 170 | 150 | 480 | 450
Property and Casualty, Commercial Insurance Product Line [Member] | Package business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 343 | 325 | 1,013 | 965
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 157 | 155 | 454 | 477
Property and Casualty, Commercial Insurance Product Line [Member] | Professional liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 65 | 63 | 190 | 183
Property and Casualty, Commercial Insurance Product Line [Member] | Bond |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 60 | 59 | 179 | 172
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 154 | 152 | 456 | 451
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 859 | 932 | 2,594 | 2,818
Property and Casualty, Personal Insurance Product Line [Member] | AARP Members [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 758 | 801 | 2,300 | 2,400
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 598 | 653 | 1,809 | 1,975
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 261 | 279 | 785 | 843
Group Insurance Policies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 1,396 | 822 | 4,198 | 2,481
Group Insurance Policies [Member] | Group disability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 684 | 386 | 2,051 | 1,146
Group Insurance Policies [Member] | Group life |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 652 | 383 | 1,968 | 1,176
Group Insurance Policies [Member] | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 60 | 53 | 179 | 159
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 267 | 251 | 786 | 735
Mutual Fund [Member] | Third party retail customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 242 | 225 | 710 | 657
Mutual Fund [Member] | Talcott Resolution [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 25 | 26 | 76 | 78
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 15 | 1 | $ 21 | 2
Operating Expense [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Distribution Costs |  | $ 48 |  | $ 140

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