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v3.25.3

Segment Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($)
Segment reporting information |  |  |  |
Number of reportable business segments | segment |  |  | 3 |
Premiums | $ 11,135 | $ 10,704 | $ 32,766 | $ 31,073
Net investment income | 1,033 | 904 | 2,905 | 2,635
Fee income | 127 | 121 | 370 | 345
Other revenues | 148 | 120 | 383 | 337
Claims and claim adjustment expenses | 6,594 | 6,996 | 21,389 | 21,025
Amortization of deferred acquisition costs | 1,849 | 1,790 | 5,429 | 5,166
General and administrative expenses | 1,572 | 1,460 | 4,576 | 4,344
Income tax expense | 456 | 300 | 901 | 669
Net realized investment gains (losses) | 27 | 55 | (28) | 25
Total revenues | 12,470 | 11,904 | 36,396 | 34,415
Core income (loss) | 1,867 | 1,218 | 3,814 | 2,899
Net realized investment gains (losses), net of tax | 21 | 42 | (22) | 18
Net income | 1,888 | 1,260 | 3,792 | 2,917
Reportable Segments [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 11,135 | 10,704 | 32,766 | 31,073
Net investment income | 1,033 | 904 | 2,905 | 2,635
Fee income | 127 | 121 | 370 | 345
Other revenues | 148 | 120 | 383 | 337
Total segment revenues | 12,443 | 11,849 | 36,424 | 34,390
Claims and claim adjustment expenses | 6,594 | 6,996 | 21,389 | 21,025
Amortization of deferred acquisition costs | 1,849 | 1,790 | 5,429 | 5,166
General and administrative expenses | 1,559 | 1,449 | 4,540 | 4,313
Income tax expense | 477 | 310 | 982 | 730
Core income (loss) | 1,964 | 1,304 | 4,084 | 3,156
Reportable Segments [Member] | Business Insurance [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 5,700 | 5,474 | 16,710 | 15,802
Net investment income | 727 | 642 | 2,045 | 1,883
Fee income | 114 | 109 | 333 | 315
Other revenues | 111 | 89 | 288 | 243
Total segment revenues | 6,652 | 6,314 | 19,376 | 18,243
Claims and claim adjustment expenses | 3,667 | 3,698 | 10,956 | 10,500
Amortization of deferred acquisition costs | 973 | 930 | 2,834 | 2,655
General and administrative expenses | 894 | 826 | 2,616 | 2,479
Income tax expense | 211 | 162 | 567 | 491
Core income (loss) | 907 | 698 | 2,403 | 2,118
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 5,196 | 4,954 | 15,261 | 14,437
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Workers' compensation [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 842 | 858 | 2,506 | 2,602
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Automobile [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 1,011 | 915 | 2,921 | 2,649
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial property [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 942 | 915 | 2,839 | 2,682
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | General liability [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 907 | 871 | 2,630 | 2,563
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Commercial multi-peril [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 1,474 | 1,374 | 4,309 | 3,890
Reportable Segments [Member] | Business Insurance [Member] | Domestic [Member] | Other [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 20 | 21 | 56 | 51
Reportable Segments [Member] | Business Insurance [Member] | International [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 504 | 520 | 1,449 | 1,365
Reportable Segments [Member] | Bond & Specialty Insurance [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 1,042 | 1,009 | 3,058 | 2,942
Net investment income | 116 | 101 | 325 | 285
Fee income | 0 | 0 | 0 | 0
Other revenues | 8 | 7 | 19 | 22
Total segment revenues | 1,166 | 1,117 | 3,402 | 3,249
Claims and claim adjustment expenses | 451 | 441 | 1,303 | 1,342
Amortization of deferred acquisition costs | 197 | 194 | 579 | 559
General and administrative expenses | 207 | 203 | 626 | 615
Income tax expense | 61 | 57 | 180 | 146
Core income (loss) | 250 | 222 | 714 | 587
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 902 | 871 | 2,655 | 2,538
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | General liability [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 463 | 454 | 1,374 | 1,317
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Fidelity and surety [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 378 | 359 | 1,103 | 1,049
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | Domestic [Member] | Other [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 61 | 58 | 178 | 172
Reportable Segments [Member] | Bond & Specialty Insurance [Member] | International [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 140 | 138 | 403 | 404
Reportable Segments [Member] | Personal Insurance [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 4,393 | 4,221 | 12,998 | 12,329
Net investment income | 190 | 161 | 535 | 467
Fee income | 13 | 12 | 37 | 30
Other revenues | 29 | 24 | 76 | 72
Total segment revenues | 4,625 | 4,418 | 13,646 | 12,898
Claims and claim adjustment expenses | 2,476 | 2,857 | 9,130 | 9,183
Amortization of deferred acquisition costs | 679 | 666 | 2,016 | 1,952
General and administrative expenses | 458 | 420 | 1,298 | 1,219
Income tax expense | 205 | 91 | 235 | 93
Core income (loss) | 807 | 384 | 967 | 451
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 4,226 | 4,056 | 12,494 | 11,835
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Automobile [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 1,987 | 1,973 | 5,931 | 5,766
Reportable Segments [Member] | Personal Insurance [Member] | Domestic [Member] | Homeowners and Other [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 2,239 | 2,083 | 6,563 | 6,069
Reportable Segments [Member] | Personal Insurance [Member] | International [Member] |  |  |  |
Segment reporting information |  |  |  |
Premiums | 167 | 165 | 504 | 494
Other [Member] |  |  |  |
Segment reporting information |  |  |  |
Core income (loss) | (97) | (86) | (270) | (257)
After-tax interest expense | $ 88 | $ 77 | $ 244 | $ 232

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