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Segment Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Segment Reporting [Abstract] |
Segment Information | Segment information is summarized in the following table:
(Dollars in millions) |  | Years ended December 31,
|  | 2023 |  | 2022 |  | 2021
Revenues: |  |  |  |  |  |
Commercial lines insurance |  |  |  |  |  |
Commercial casualty |  | $ | 1,481 |  |  | $ | 1,416 |  |  | $ | 1,270 |
Commercial property |  | 1,264 |  |  | 1,136 |  |  | 1,043 |
Commercial auto |  | 862 |  |  | 842 |  |  | 794 |
Workers' compensation |  | 277 |  |  | 284 |  |  | 268 |
Other commercial |  | 380 |  |  | 346 |  |  | 299 |
Commercial lines insurance premiums |  | 4,264 |  |  | 4,024 |  |  | 3,674 |
Fee revenues |  | 4 |  |  | 4 |  |  | 4 |
Total commercial lines insurance |  | 4,268 |  |  | 4,028 |  |  | 3,678 |
Personal lines insurance |  |  |  |  |  |
Personal auto |  | 721 |  |  | 626 |  |  | 609 |
Homeowner |  | 1,044 |  |  | 829 |  |  | 726 |
Other personal |  | 279 |  |  | 234 |  |  | 207 |
Personal lines insurance premiums |  | 2,044 |  |  | 1,689 |  |  | 1,542 |
Fee revenues |  | 4 |  |  | 4 |  |  | 4 |
Total personal lines insurance |  | 2,048 |  |  | 1,693 |  |  | 1,546 |
Excess and surplus lines insurance |  | 542 |  |  | 485 |  |  | 398 |
Fee revenues |  | 3 |  |  | 2 |  |  | 2 |
Total excess and surplus lines insurance |  | 545 |  |  | 487 |  |  | 400 |
Life insurance premiums |  | 313 |  |  | 301 |  |  | 294 |
Fee revenues |  | 10 |  |  | 4 |  |  | 5 |
Total life insurance |  | 323 |  |  | 305 |  |  | 299 |
Investments |  |  |  |  |  |
Investment income, net of expenses |  | 894 |  |  | 781 |  |  | 714 |
Investment gains and losses, net |  | 1,127 |  |  | (1,467) |  |  | 2,409 |
Total investment revenue |  | 2,021 |  |  | (686) |  |  | 3,123 |
Other |  |  |  |  |  |
Premiums |  | 795 |  |  | 726 |  |  | 570 |
Other |  | 13 |  |  | 10 |  |  | 10 |
Total other revenue |  | 808 |  |  | 736 |  |  | 580 |
Total revenues |  | $ | 10,013 |  |  | $ | 6,563 |  |  | $ | 9,626 |
Income (loss) before income taxes: |  |  |  |  |  |
Insurance underwriting results |  |  |  |  |  |
Commercial lines insurance |  | $ | 168 |  |  | $ | 38 |  |  | $ | 598 |
Personal lines insurance |  | (4) |  |  | 18 |  |  | 97 |
Excess and surplus lines insurance |  | 54 |  |  | 48 |  |  | 44 |
Life insurance |  | 41 |  |  | 27 |  |  | 12 |
Investments |  | 1,900 |  |  | (795) |  |  | 3,018 |
Other |  | 117 |  |  | (30) |  |  | (71) |
Total income (loss) before income taxes |  | $ | 2,276 |  |  | $ | (694) |  |  | $ | 3,698 |
|  | December 31, |  | December 31, |  |
Identifiable assets: |  | 2023 |  | 2022 |  |
Property casualty insurance |  | $ | 5,294 |  |  | $ | 5,178 |  |  |
Life insurance |  | 1,562 |  |  | 1,518 |  |  |
Investments |  | 24,999 |  |  | 22,133 |  |  |
Other |  | 914 |  |  | 903 |  |  |
Total |  | $ | 32,769 |  |  | $ | 29,732 |  |  |

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