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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | $ 1,585 | $ 1,507 | $ 3,131 | $ 2,944
Net investment income | 188 | 198 | 386 | 415
Other income | 27 | 25 | 66 | 57
Revenues before realized gains (losses) | 1,902 | 1,842 | 3,794 | 3,628
Realized gains (losses) on securities | (2) | (2) | 12 | (48)
Total revenues | 1,900 | 1,840 | 3,806 | 3,580
Operating Segments | Property and Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 1,585 | 1,507 | 3,131 | 2,944
Net investment income | 189 | 191 | 394 | 398
Other income | 2 | 3 | 4 | 8
Revenues before realized gains (losses) | 1,776 | 1,701 | 3,529 | 3,350
Operating Segments | Property and Casualty Insurance | Property and transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 543 | 534 | 1,056 | 1,009
Operating Segments | Property and Casualty Insurance | Specialty casualty |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 739 | 711 | 1,469 | 1,415
Operating Segments | Property and Casualty Insurance | Specialty financial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 241 | 195 | 484 | 391
Operating Segments | Property and Casualty Insurance | Other specialty |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 62 | 67 | 122 | 129
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues before realized gains (losses) | $ 126 | $ 141 | $ 265 | $ 278

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