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Segment Information - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 5,779 | $ 5,382
Net investment income | 593 | 515
Net realized gains (losses) | 28 | (7)
Other revenues | 19 | 20
Total revenues | 6,419 | 5,910
Corporate |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 10 | 9
Commercial Lines | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 3,059 | 2,776
Commercial Lines | Operating Segments [Member] | Workers’ compensation |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 917 | 898
Commercial Lines | Operating Segments [Member] | Liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 526 | 486
Commercial Lines | Operating Segments [Member] | Marine |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 67 | 59
Commercial Lines | Operating Segments [Member] | Package business |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 549 | 484
Commercial Lines | Operating Segments [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 290 | 228
Commercial Lines | Operating Segments [Member] | Professional liability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 203 | 188
Commercial Lines | Operating Segments [Member] | Bond |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 78 | 77
Commercial Lines | Operating Segments [Member] | Assumed reinsurance |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 181 | 138
Commercial Lines | Operating Segments [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 248 | 218
Personal Lines | AARP Members [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 758 | 689
Personal Lines | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 821 | 747
Personal Lines | Operating Segments [Member] | Property |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 249 | 232
Personal Lines | Operating Segments [Member] | Automobile |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 572 | 515
Group Benefits | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 1,639 | 1,609
Group Benefits | Operating Segments [Member] | Group disability |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 890 | 866
Group Benefits | Operating Segments [Member] | Group life |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 645 | 643
Group Benefits | Operating Segments [Member] | Other |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 104 | 100
Hartford Funds | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 250 | 241
Hartford Funds | Operating Segments [Member] | Mutual fund and ETF |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | 231 | 223
Hartford Funds | Operating Segments [Member] | Third-party life and annuity separate accounts |  |
Segment Reporting Information [Line Items] |  |
Earned premiums and fee income | $ 19 | $ 18

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