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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 4,724 | $ 4,331 | $ 13,470 | $ 12,866
Net investment income | 490 | 444 | 1,448 | 1,323
Realized Investment Gains (Losses) | 89 | 38 | 332 | 60
Other revenues | 44 | 29 | 129 | 73
Total revenues | 5,347 | 4,842 | 15,379 | 14,322
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 18 | 15 | 43 | 21
Property and Casualty, Commercial Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 2,258 | 1,794 | 6,040 | 5,267
Property and Casualty, Commercial Insurance [Member] | Workers’ compensation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 825 | 845 | 2,480 | 2,495
Property and Casualty, Commercial Insurance [Member] | Liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 330 | 170 | 731 | 480
Property and Casualty, Commercial Insurance [Member] | Marine |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 59 | 0 | 86 | 0
Property and Casualty, Commercial Insurance [Member] | Package business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 376 | 343 | 1,092 | 1,013
Property and Casualty, Commercial Insurance [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 198 | 154 | 529 | 456
Property and Casualty, Commercial Insurance [Member] | Professional liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 137 | 65 | 304 | 190
Property and Casualty, Commercial Insurance [Member] | Bond |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 67 | 60 | 192 | 179
Property and Casualty, Commercial Insurance [Member] | Assumed Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 75 | 0 | 104 | 0
Property and Casualty, Commercial Insurance [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 191 | 157 | 522 | 454
Property and Casualty, Personal Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 812 | 859 | 2,431 | 2,594
Property and Casualty, Personal Insurance [Member] | AARP Members [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 729 | 758 | 2,200 | 2,300
Property and Casualty, Personal Insurance [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 248 | 261 | 741 | 785
Property and Casualty, Personal Insurance [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 564 | 598 | 1,690 | 1,809
Group Insurance Policy [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 1,382 | 1,396 | 4,213 | 4,198
Group Insurance Policy [Member] | Group disability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 697 | 684 | 2,124 | 2,051
Group Insurance Policy [Member] | Group life |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 621 | 652 | 1,902 | 1,968
Group Insurance Policy [Member] | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 64 | 60 | 187 | 179
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 254 | 267 | 743 | 786
Mutual Fund [Member] | Third party retail customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 231 | 242 | 674 | 710
Mutual Fund [Member] | Talcott Resolution [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 23 | $ 25 | $ 69 | $ 76

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