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Segment information (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] |  |  |  |
Net premiums written | $ 13,360 | $ 11,951 | $ 25,581 | $ 22,661
Net premiums earned | 12,292 | 10,999 | 23,875 | 21,141
Losses and loss expenses | 6,431 | 5,683 | 12,158 | 10,831
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 1,219 | 830 | 2,399 | 1,627
Policy acquisition costs | 2,226 | 2,016 | 4,433 | 3,964
Administrative expenses | 1,094 | 969 | 2,164 | 1,899
Underwriting income (loss) | 1,322 | 1,501 | 2,721 | 2,820
Net investment income (loss) | 1,468 | 1,145 | 2,859 | 2,252
Other (income) expense | (110) | (100) | (301) | (396)
Amortization of purchased intangibles | 80 | 70 | 160 | 142
Segment Income (loss) | 2,820 | 2,676 | 5,721 | 5,326
Net realized gains (losses) | 104 | (304) | 3 | (381)
Market risk benefits gains (losses) | (29) | (7) | (8) | (122)
Interest Income (Expense), Net | 182 | 165 | 360 | 325
Cigna integration expenses | 7 | 15 | 14 | 37
Income tax expense | 490 | 392 | 832 | 776
Net Income | 2,216 | 1,793 | 4,510 | 3,685
Net income (loss) attributable to noncontrolling interests | (14) | 0 | 137 | 0
Net income (loss) | 2,230 | 1,793 | 4,373 | 3,685
North America Commercial P&C Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 5,501 | 5,155 | 10,190 | 9,443
Net premiums earned | 4,900 | 4,606 | 9,780 | 8,975
Losses and loss expenses | 3,074 | 2,871 | 6,249 | 5,600
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 0 | 0 | 0 | 0
Policy acquisition costs | 660 | 614 | 1,348 | 1,227
Administrative expenses | 327 | 316 | 655 | 611
Underwriting income (loss) | 839 | 805 | 1,528 | 1,537
Net investment income (loss) | 863 | 726 | 1,689 | 1,424
Other (income) expense | 15 | 5 | 22 | 12
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Segment Income (loss) | 1,687 | 1,526 | 3,195 | 2,949
North American Personal P&C Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 1,776 | 1,581 | 3,232 | 2,877
Net premiums earned | 1,512 | 1,357 | 2,983 | 2,677
Losses and loss expenses | 876 | 846 | 1,775 | 1,734
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 0 | 0 | 0 | 0
Policy acquisition costs | 299 | 277 | 599 | 549
Administrative expenses | 88 | 84 | 174 | 163
Underwriting income (loss) | 249 | 150 | 435 | 231
Net investment income (loss) | 108 | 86 | 210 | 168
Other (income) expense | (2) | (1) | (1) | 0
Amortization of purchased intangibles | 2 | 3 | 4 | 5
Segment Income (loss) | 357 | 234 | 642 | 394
North America Agricultural Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 758 | 767 | 1,007 | 1,060
Net premiums earned | 626 | 635 | 754 | 794
Losses and loss expenses | 543 | 507 | 592 | 647
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 0 | 0 | 0 | 0
Policy acquisition costs | 45 | 37 | 66 | 52
Administrative expenses | 3 | 3 | 5 | 6
Underwriting income (loss) | 35 | 88 | 91 | 89
Net investment income (loss) | 21 | 14 | 42 | 31
Other (income) expense | 0 | (1) | 0 | 0
Amortization of purchased intangibles | 7 | 7 | 13 | 13
Segment Income (loss) | 49 | 96 | 120 | 107
Overseas General Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 3,334 | 2,885 | 7,169 | 6,148
Net premiums earned | 3,347 | 2,908 | 6,545 | 5,694
Losses and loss expenses | 1,671 | 1,267 | 3,097 | 2,504
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 92 | 137 | 192 | 247
Policy acquisition costs | 842 | 746 | 1,665 | 1,459
Administrative expenses | 348 | 292 | 679 | 572
Underwriting income (loss) | 394 | 466 | 912 | 912
Net investment income (loss) | 283 | 200 | 550 | 388
Other (income) expense | 4 | (10) | 9 | (19)
Amortization of purchased intangibles | 20 | 15 | 40 | 33
Segment Income (loss) | 653 | 661 | 1,413 | 1,286
Global Reinsurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 411 | 293 | 770 | 570
Net premiums earned | 339 | 237 | 634 | 481
Losses and loss expenses | 155 | 91 | 292 | 203
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 0 | 0 | 0 | 0
Policy acquisition costs | 80 | 65 | 161 | 127
Administrative expenses | 11 | 9 | 20 | 18
Underwriting income (loss) | 93 | 72 | 161 | 133
Net investment income (loss) | 58 | 48 | 115 | 97
Other (income) expense | 0 | 0 | 0 | (1)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Segment Income (loss) | 151 | 120 | 276 | 231
Life Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 1,580 | 1,270 | 3,213 | 2,563
Net premiums earned | 1,568 | 1,256 | 3,179 | 2,520
Losses and loss expenses | 22 | 35 | 54 | 67
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 1,031 | 705 | 2,101 | 1,417
Policy acquisition costs | 300 | 277 | 594 | 550
Administrative expenses | 218 | 170 | 425 | 337
Underwriting income (loss) | (3) | 69 | 5 | 149
Net investment income (loss) | 258 | 161 | 488 | 314
Other (income) expense | (32) | (26) | (72) | (41)
Amortization of purchased intangibles | 11 | 2 | 21 | 6
Segment Income (loss) | 276 | 254 | 544 | 498
Segment Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Losses and loss expenses | 93 | 61 | 103 | 72
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 0 | 0 | 0 | 0
Policy acquisition costs | 0 | 0 | 0 | 0
Administrative expenses | 99 | 95 | 206 | 192
Underwriting income (loss) | (192) | (156) | (309) | (264)
Net investment income (loss) | (32) | 3 | (58) | 14
Other (income) expense | 7 | 14 | (61) | (200)
Amortization of purchased intangibles | 40 | 43 | 82 | 85
Segment Income (loss) | (271) | (210) | (388) | (135)
Net realized gains (losses) | 22 | (309) | (78) | (385)
Market risk benefits gains (losses) | (29) | (7) | (8) | (122)
Interest Income (Expense), Net | 182 | 165 | 360 | 325
Cigna integration expenses | 7 | 15 | 14 | 37
Income tax expense | 490 | 392 | 832 | 776
Net Income | (957) | (1,098) | (1,680) | (1,780)
Net income (loss) attributable to noncontrolling interests | (14) |  | 137 |
Net income (loss) | (943) |  | (1,817) |
Segment Measure Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Losses and loss expenses | (3) | 5 | (4) | 4
Policy benefits (includes remeasurement losses of $3, $5, $22 and $4) | 96 | (12) | 106 | (37)
Policy acquisition costs | 0 | 0 | 0 | 0
Administrative expenses |  | 0 | 0 | 0
Underwriting income (loss) | (93) | 7 | (102) | 33
Net investment income (loss) | (91) | (93) | (177) | (184)
Other (income) expense | (102) | (81) | (198) | (147)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Segment Income (loss) | (82) | (5) | (81) | (4)
Net realized gains (losses) | 82 | 5 | 81 | 4
Market risk benefits gains (losses) | 0 | 0 | 0 | 0
Interest Income (Expense), Net | 0 | 0 | 0 | 0
Cigna integration expenses | 0 | 0 | 0 | 0
Income tax expense | 0 | 0 | 0 | 0
Net Income | 0 | $ 0 | 0 | $ 0
Net income (loss) attributable to noncontrolling interests | 0 |  | 0 |
Net income (loss) | $ 0 |  | $ 0 |

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- Definition The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis. + References No definition available. + Details
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