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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 4,711 | $ 4,254
Net investment income | 459 | 470
Realized Investment Gains (Losses) | (231) | 163
Other revenues | 17 | 53
Total revenues | 4,956 | 4,940
Corporate |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 17 | 13
Property and Casualty, Commercial Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 2,273 | 1,786
Property and Casualty, Commercial Insurance [Member] | Workers’ compensation |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 816 | 825
Property and Casualty, Commercial Insurance [Member] | Liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 343 | 168
Property and Casualty, Commercial Insurance [Member] | Marine |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 65 | 0
Property and Casualty, Commercial Insurance [Member] | Package business |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 377 | 352
Property and Casualty, Commercial Insurance [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 205 | 156
Property and Casualty, Commercial Insurance [Member] | Professional liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 143 | 68
Property and Casualty, Commercial Insurance [Member] | Bond |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 70 | 60
Property and Casualty, Commercial Insurance [Member] | Assumed reinsurance |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 66 | 0
Property and Casualty, Commercial Insurance [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 188 | 157
Property and Casualty, Personal Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 783 | 808
Property and Casualty, Personal Insurance [Member] | AARP Members [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 707 | 722
Property and Casualty, Personal Insurance [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 240 | 247
Property and Casualty, Personal Insurance [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 543 | 561
Group Insurance Policy [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,391 | 1,409
Group Insurance Policy [Member] | Group disability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 726 | 704
Group Insurance Policy [Member] | Group life |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 607 | 643
Group Insurance Policy [Member] | Other |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 58 | 62
Mutual Fund [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 247 | 238
Mutual Fund [Member] | Third party retail customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 225 | 216
Mutual Fund [Member] | Talcott Resolution [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 22 | $ 22

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