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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 4,285 | $ 3,741 | $ 8,535 | $ 7,457
Net investment income | 428 | 395 | 879 | 805
Realized Investment Gains (Losses) | 52 | 55 | 22 | 79
Other revenues | 24 | 23 | 44 | 42
Total revenues | 4,789 | 4,214 | 9,480 | 8,383
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 1,753 | 1,729 | 3,473 | 3,427
Property and Casualty, Commercial Insurance Product Line [Member] | Workers’ compensation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 832 | 820 | 1,650 | 1,633
Property and Casualty, Commercial Insurance Product Line [Member] | Liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 159 | 152 | 310 | 300
Property and Casualty, Commercial Insurance Product Line [Member] | Package business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 338 | 326 | 670 | 640
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 148 | 161 | 297 | 322
Property and Casualty, Commercial Insurance Product Line [Member] | Professional liability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 63 | 60 | 125 | 120
Property and Casualty, Commercial Insurance Product Line [Member] | Bond |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 61 | 58 | 119 | 113
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 152 | 152 | 302 | 299
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 866 | 941 | 1,735 | 1,886
Property and Casualty, Personal Insurance Product Line [Member] | AARP Members [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 758 | 800 | 1,500 | 1,600
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 604 | 660 | 1,211 | 1,322
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 262 | 281 | 524 | 564
Group Insurance Policies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 1,401 | 824 | 2,802 | 1,659
Group Insurance Policies [Member] | Group disability |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 690 | 379 | 1,367 | 760
Group Insurance Policies [Member] | Group life |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 652 | 394 | 1,316 | 793
Group Insurance Policies [Member] | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 59 | 51 | 119 | 106
Mutual Fund [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 261 | 247 | 519 | 484
Mutual Fund [Member] | Talcott Resolution [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 25 | 26 | 51 | 52
Mutual Fund [Member] | Mutual fund and Exchange-Traded Products (ETP) [2] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | 236 | 221 | 468 | 432
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned premiums and fee income | $ 4 | 0 | $ 6 | 1
Operating Expense [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Distribution Costs |  | $ 46 |  | $ 92

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