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Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Net premiums written | $ 47,361 | $ 41,720 | $ 37,827
Net premiums earned | 45,712 | 40,360 | 36,292
Losses and loss expenses | 24,100 | 22,572 | 21,030
Policy benefits | 3,628 | 2,314 | 1,740
Policy acquisition costs | 8,259 | 7,339 | 6,758
Administrative expenses | 4,007 | 3,395 | 3,135
Underwriting Income (Loss) | 5,718 | 4,740 | 3,629
Net investment income | 4,937 | 3,742 | 3,456
Other (income) expense | (836) | 89 | (2,367)
Amortization of purchased intangibles | 310 | 285 | 287
Segment income (loss) | 11,181 | 8,108 | 9,165
Net realized gains (losses) | (607) | (1,085) | 1,030
Market risk benefits gains (losses) | (307) | 80 | 91
Interest expense | 672 | 570 | 492
Cigna integration expenses | 69 | 48 | 0
Income tax expense | 511 | 1,239 | 1,269
Net income | 9,015 | 5,246 | 8,525
Net loss attributable to noncontrolling interests | (13) | 0 | 0
Net income attributable to Chubb | 9,028 | 5,246 | 8,525
North America Commercial P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 19,237 | 17,889 | 16,415
Net premiums earned | 18,416 | 17,107 | 15,461
Losses and loss expenses | 11,256 | 10,828 | 10,015
Policy benefits | 0 | 0 | 0
Policy acquisition costs | 2,515 | 2,313 | 2,082
Administrative expenses | 1,250 | 1,113 | 1,052
Underwriting Income (Loss) | 3,395 | 2,853 | 2,312
Net investment income | 3,017 | 2,247 | 2,078
Other (income) expense | 22 | 17 | 31
Amortization of purchased intangibles | 0 | 0 | 0
Segment income (loss) | 6,390 | 5,083 | 4,359
North America Personal P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 5,878 | 5,313 | 5,002
Net premiums earned | 5,536 | 5,180 | 4,915
Losses and loss expenses | 3,511 | 3,186 | 2,924
Policy benefits | 0 | 0 | 0
Policy acquisition costs | 1,128 | 1,057 | 1,001
Administrative expenses | 329 | 291 | 276
Underwriting Income (Loss) | 568 | 646 | 714
Net investment income | 358 | 283 | 249
Other (income) expense | 3 | 4 | (2)
Amortization of purchased intangibles | 9 | 10 | 10
Segment income (loss) | 914 | 915 | 955
North America Agricultural Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 3,188 | 2,907 | 2,388
Net premiums earned | 3,169 | 2,838 | 2,338
Losses and loss expenses | 2,874 | 2,557 | 1,962
Policy benefits | 0 | 0 | 0
Policy acquisition costs | 150 | 126 | 124
Administrative expenses | (1) | (10) | (3)
Underwriting Income (Loss) | 146 | 165 | 255
Net investment income | 63 | 36 | 28
Other (income) expense | 1 | 1 | 1
Amortization of purchased intangibles | 25 | 26 | 26
Segment income (loss) | 183 | 174 | 256
Overseas General Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 12,575 | 11,060 | 10,713
Net premiums earned | 12,231 | 10,803 | 10,441
Losses and loss expenses | 5,643 | 4,894 | 4,783
Policy benefits | 457 | 358 | 360
Policy acquisition costs | 3,113 | 2,818 | 2,799
Administrative expenses | 1,219 | 1,070 | 1,078
Underwriting Income (Loss) | 1,799 | 1,663 | 1,421
Net investment income | 895 | 626 | 597
Other (income) expense | (25) | 2 | 0
Amortization of purchased intangibles | 70 | 57 | 48
Segment income (loss) | 2,649 | 2,230 | 1,970
Global Reinsurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 1,018 | 943 | 873
Net premiums earned | 962 | 922 | 798
Losses and loss expenses | 426 | 670 | 632
Policy benefits | 0 | 0 | 0
Policy acquisition costs | 264 | 240 | 200
Administrative expenses | 37 | 36 | 35
Underwriting Income (Loss) | 235 | (24) | (69)
Net investment income | 208 | 281 | 331
Other (income) expense | (2) | 1 | 0
Amortization of purchased intangibles | 0 | 0 | 0
Segment income (loss) | 445 | 256 | 262
Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 5,465 | 3,608 | 2,436
Net premiums earned | 5,398 | 3,510 | 2,339
Losses and loss expenses | 114 | 85 | 150
Policy benefits | 3,216 | 1,998 | 1,388
Policy acquisition costs | 1,089 | 785 | 552
Administrative expenses | 771 | 510 | 332
Underwriting Income (Loss) | 208 | 132 | (83)
Net investment income | 756 | 509 | 407
Other (income) expense | (115) | (30) | (108)
Amortization of purchased intangibles | 30 | 10 | 5
Segment income (loss) | 1,049 | 661 | 427
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0
Losses and loss expenses | 281 | 363 | 572
Policy benefits | 0 | 0 | 0
Policy acquisition costs | 0 | 0 | 0
Administrative expenses | 402 | 385 | 365
Underwriting Income (Loss) | (683) | (748) | (937)
Net investment income | 25 | 0 | (55)
Other (income) expense | (380) | 292 | (2,118)
Amortization of purchased intangibles | 176 | 182 | 198
Segment income (loss) | (454) | (1,222) | 928
Net realized gains (losses) | (602) | (1,074) | 1,038
Market risk benefits gains (losses) | (307) | 80 | 91
Interest expense | 672 | 570 | 492
Cigna integration expenses | 69 | 48 |
Income tax expense | 511 | 1,239 | 1,269
Net income | (2,615) | (4,073) | 296
Net loss attributable to noncontrolling interests | (13) |  |
Net income attributable to Chubb | (2,602) |  |
Segment Measure Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums written | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0
Losses and loss expenses | (5) | (11) | (8)
Policy benefits | (45) | (42) | (8)
Policy acquisition costs | 0 | 0 | 0
Administrative expenses | 0 | 0 | 0
Underwriting Income (Loss) | 50 | 53 | 16
Net investment income | (385) | (240) | (179)
Other (income) expense | (340) | (198) | (171)
Amortization of purchased intangibles | 0 | 0 | 0
Segment income (loss) | 5 | 11 | 8
Net realized gains (losses) | (5) | (11) | (8)
Market risk benefits gains (losses) | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Cigna integration expenses | 0 | 0 |
Income tax expense | 0 | 0 | 0
Net income | 0 | $ 0 | $ 0
Net loss attributable to noncontrolling interests | 0 |  |
Net income attributable to Chubb | $ 0 |  |

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