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Segment information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Net premiums written | $ 12,221 | $ 10,710
Net premiums earned | 11,583 | 10,142
Losses and loss expenses | 5,727 | 5,148
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 1,180 | 797
Policy acquisition costs | 2,207 | 1,948
Administrative expenses | 1,070 | 930
Underwriting income (loss) | 1,399 | 1,319
Net investment income (loss) | 1,391 | 1,107
Other (income) expense | (191) | (296)
Amortization of purchased intangibles | 80 | 72
Segment Income (loss) | 2,901 | 2,650
Net realized gains (losses) | (101) | (77)
Market risk benefits gains (losses) | 21 | (115)
Interest Income (Expense), Net | 178 | 160
Cigna integration expenses | 7 | 22
Income tax expense | 342 | 384
Net Income | 2,294 | 1,892
Net income attributable to noncontrolling interests | 151 | 0
Net income (loss) | 2,143 | 1,892
North America Commercial P&C Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 4,689 | 4,288
Net premiums earned | 4,880 | 4,369
Losses and loss expenses | 3,175 | 2,729
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 0 | 0
Policy acquisition costs | 688 | 613
Administrative expenses | 328 | 295
Underwriting income (loss) | 689 | 732
Net investment income (loss) | 826 | 698
Other (income) expense | 7 | 7
Amortization of purchased intangibles | 0 | 0
Segment Income (loss) | 1,508 | 1,423
North American Personal P&C Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 1,456 | 1,296
Net premiums earned | 1,471 | 1,320
Losses and loss expenses | 899 | 888
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 0 | 0
Policy acquisition costs | 300 | 272
Administrative expenses | 86 | 79
Underwriting income (loss) | 186 | 81
Net investment income (loss) | 102 | 82
Other (income) expense | 1 | 1
Amortization of purchased intangibles | 2 | 2
Segment Income (loss) | 285 | 160
North America Agricultural Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 249 | 293
Net premiums earned | 128 | 159
Losses and loss expenses | 49 | 140
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 0 | 0
Policy acquisition costs | 21 | 15
Administrative expenses | 2 | 3
Underwriting income (loss) | 56 | 1
Net investment income (loss) | 21 | 17
Other (income) expense | 0 | 1
Amortization of purchased intangibles | 6 | 6
Segment Income (loss) | 71 | 11
Overseas General Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 3,835 | 3,263
Net premiums earned | 3,198 | 2,786
Losses and loss expenses | 1,426 | 1,237
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 100 | 110
Policy acquisition costs | 823 | 713
Administrative expenses | 331 | 280
Underwriting income (loss) | 518 | 446
Net investment income (loss) | 267 | 188
Other (income) expense | 5 | (9)
Amortization of purchased intangibles | 20 | 18
Segment Income (loss) | 760 | 625
Global Reinsurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 359 | 277
Net premiums earned | 295 | 244
Losses and loss expenses | 137 | 112
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 0 | 0
Policy acquisition costs | 81 | 62
Administrative expenses | 9 | 9
Underwriting income (loss) | 68 | 61
Net investment income (loss) | 57 | 49
Other (income) expense | 0 | (1)
Amortization of purchased intangibles | 0 | 0
Segment Income (loss) | 125 | 111
Life Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 1,633 | 1,293
Net premiums earned | 1,611 | 1,264
Losses and loss expenses | 32 | 32
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 1,070 | 712
Policy acquisition costs | 294 | 273
Administrative expenses | 207 | 167
Underwriting income (loss) | 8 | 80
Net investment income (loss) | 230 | 153
Other (income) expense | (40) | (15)
Amortization of purchased intangibles | 10 | 4
Segment Income (loss) | 268 | 244
Segment Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Losses and loss expenses | 10 | 11
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 0 | 0
Policy acquisition costs | 0 | 0
Administrative expenses | 107 | 97
Underwriting income (loss) | (117) | (108)
Net investment income (loss) | (26) | 11
Other (income) expense | (68) | (214)
Amortization of purchased intangibles | 42 | 42
Segment Income (loss) | (117) | 75
Net realized gains (losses) | (100) | (76)
Market risk benefits gains (losses) | 21 | (115)
Interest Income (Expense), Net | 178 | 160
Cigna integration expenses | 7 | 22
Income tax expense | 342 | 384
Net Income | (723) | (682)
Net income attributable to noncontrolling interests | 151 |
Net income (loss) | (874) |
Segment Measure Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Losses and loss expenses | (1) | (1)
Policy benefits (includes remeasurement gains (losses) of $(19) and $1) | 10 | (25)
Policy acquisition costs | 0 | 0
Administrative expenses |  | 0
Underwriting income (loss) | (9) | 26
Net investment income (loss) | (86) | (91)
Other (income) expense | (96) | (66)
Amortization of purchased intangibles | 0 | 0
Segment Income (loss) | 1 | 1
Net realized gains (losses) | (1) | (1)
Market risk benefits gains (losses) | 0 | 0
Interest Income (Expense), Net | 0 | 0
Cigna integration expenses | 0 | 0
Income tax expense | 0 | 0
Net Income | 0 | $ 0
Net income attributable to noncontrolling interests | 0 |
Net income (loss) | $ 0 |

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