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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 4,254 | $ 4,250
Net investment income | 470 | 451
Realized Investment Gains (Losses) | 163 | (30)
Other revenues | 53 | 20
Total revenues | 4,940 | 4,691
Corporate |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 13 | 2
Property and Casualty, Commercial Insurance Product Line [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,786 | 1,720
Property and Casualty, Commercial Insurance Product Line [Member] | Workers’ compensation |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 825 | 818
Property and Casualty, Commercial Insurance Product Line [Member] | Liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 168 | 151
Property and Casualty, Commercial Insurance Product Line [Member] | Package business |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 352 | 332
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 157 | 149
Property and Casualty, Commercial Insurance Product Line [Member] | Professional liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 68 | 62
Property and Casualty, Commercial Insurance Product Line [Member] | Bond |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 60 | 58
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 156 | 150
Property and Casualty, Personal Insurance Product Line [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 808 | 869
Property and Casualty, Personal Insurance Product Line [Member] | AARP Members [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 722 | 758
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 561 | 607
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 247 | 262
Group Insurance Policies [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,409 | 1,401
Group Insurance Policies [Member] | Group disability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 704 | 677
Group Insurance Policies [Member] | Group life |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 643 | 664
Group Insurance Policies [Member] | Other |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 62 | 60
Mutual Fund [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 238 | 258
Mutual Fund [Member] | Third party retail customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 216 | 232
Mutual Fund [Member] | Talcott Resolution [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 22 | $ 26

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