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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 4,250 | $ 3,716
Net investment income | 451 | 410
Realized Investment Gains (Losses) | (30) | 24
Other Income | 20 | 19
Total revenues | 4,691 | 4,169
Operating Segments | Commercial Lines Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,720 | 1,698
Operating Segments | Commercial Lines Segment [Member] | Workers' compensation |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 818 | 813
Operating Segments | Commercial Lines Segment [Member] | Liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 151 | 148
Operating Segments | Commercial Lines Segment [Member] | Package business |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 332 | 314
Operating Segments | Commercial Lines Segment [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 149 | 161
Operating Segments | Commercial Lines Segment [Member] | Professional liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 62 | 60
Operating Segments | Commercial Lines Segment [Member] | Bond |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 58 | 55
Operating Segments | Commercial Lines Segment [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 150 | 147
Operating Segments | Personal Lines Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 869 | 945
Operating Segments | Personal Lines Segment [Member] | AARP Members [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 758 | 800
Operating Segments | Personal Lines Segment [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 607 | 662
Operating Segments | Personal Lines Segment [Member] | Homeowners |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 262 | 283
Operating Segments | Group Benefits Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,401 | 835
Operating Segments | Group Benefits Segment [Member] | Group disability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 677 | 381
Operating Segments | Group Benefits Segment [Member] | Group life |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 664 | 399
Operating Segments | Group Benefits Segment [Member] | Other |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 60 | 55
Operating Segments | Mutual Funds |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 258 | 237
Operating Segments | Mutual Funds | Discontinued Operations, Held-for-sale |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 26 | 26
Operating Segments | Mutual Funds | Mutual Fund |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 232 | 211
Corporate |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 2 | $ 1

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