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Segment information
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Segment information Segment information
Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. These segments distribute their products through various forms of brokers, agencies, and direct marketing programs. All business segments have established relationships with reinsurance intermediaries. Commencing in the third quarter of 2023, the results of Huatai Group's life and asset management business are included in the Life Insurance segment, and the results of Huatai Group's P&C business are included in the Overseas General Insurance segment. Results for Huatai Group’s non-insurance operations, comprising real estate and holding company activity, are included in Corporate. Commencing in the third quarter of 2022, the results of Cigna's business in Asia are included in our Life Insurance segment and, to a lesser extent, Overseas General Insurance segment according to the nature of the business written.

Management uses underwriting income (loss) as the basis for segment performance for its P&C operations. P&C underwriting income (loss) excludes the Life Insurance segment and is calculated by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. Segment income (loss) includes Underwriting income (loss), Net investment income (loss), and Other operating income and expense items such as each segment's share of the operating income (loss) related to partially-owned entities and miscellaneous income and expense items for which the segments are held accountable. Our main measure of segment performance is Segment income (loss), which also includes Amortization of purchased intangibles acquired by the segment. We determined that this definition of Segment income (loss) is appropriate and aligns with how the business is managed. We continue to evaluate our segments as our business continues to evolve and may further refine our segments and Segment income (loss) measures.
Revenue and expenses managed at the corporate level, including Net realized gains (losses), Market risk benefits gains (losses), Interest expense, Cigna integration expenses, Income tax, and Net income (loss) attributable to noncontrolling interests are reported within Corporate. Cigna integration expenses are one-time costs that are directly attributable to third-party consulting fees, employee-related retention costs, and other professional and legal fees primarily related to the acquisition of Cigna's business in Asia. These items are not allocated to the segment level as they are one-time in nature and are not related to the ongoing business activities of the segment. The Chief Executive Officer does not manage segment results or allocate resources to segments when considering these costs, and therefore are excluded from our definition of Segment income (loss).

Certain items are presented in a different manner for segment reporting purposes than in the Consolidated Financial Statements. These items are reconciled to the consolidated presentation in the Segment measure reclass column below and include:

•Losses and loss expenses include realized gains and losses on crop derivatives. These derivatives were purchased to provide economic benefit, in a manner similar to reinsurance protection, in the event that a significant decline in commodity pricing impacts underwriting results. We view gains and losses on these derivatives as part of the results of our underwriting operations, and therefore realized gains (losses) from these derivatives are reclassified to Losses and loss expenses.

•Policy benefits include fair value changes on separate accounts that do not qualify for separate accounting under GAAP. These gains and losses have been reclassified from Other (income) expense. We view gains and losses from fair value changes in both separate account assets and liabilities as part of the results of our underwriting operations, and therefore these gains and losses are reclassified to Policy benefits.
•Net investment income includes investment income reclassified from Other (income) expense related to partially-owned investment companies (private equity partnerships) where our ownership interest is in excess of three percent. We view investment income from these equity-method private equity partnerships as Net investment income for segment reporting purposes.
The following tables present the Statement of Operations by segment:
For the Three Months Ended
September 30, 2023
(in millions of U.S. dollars) 		North America Commercial P&C InsuranceNorth America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General InsuranceGlobal
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb Consolidated
Net premiums written$5,132 $1,527 $1,521 $3,211 $261 $1,452 $— $— $13,104 
Net premiums earned4,735 1,407 1,540 3,311 239 1,442 — — 12,674 
Losses and loss expenses3,025 900 1,356 1,635 116 20 61 (7)7,106 
Policy benefits— — — 91 — 866 — (19)938 
Policy acquisition costs640 287 76 827 69 279 — — 2,178 
Administrative expenses323 84 3 327 9 216 98 — 1,060 
Underwriting income (loss)747 136 105 431 45 61 (159)26 1,392 
Net investment income780 94 12 248 47 211 14 (92)1,314 
Other (income) expense6 2 — (10)— (28)(51)(73)(154)
Amortization expense of
   purchased intangibles		— 3 6 19 — 12 44 — 84 
Segment income (loss)$1,521 $225 $111 $670 $92 $288 $(138)$7 $2,776 
Net realized gains (losses)(96)(7)(103)
Market risk benefits gains (losses)(32)— (32)
Interest expense174 — 174 
Cigna integration expenses14 — 14 
Income tax expense413 — 413 
Net income (loss)(867)— 2,040 
Net loss attributable to noncontrolling interests
(3)— (3)
Net income (loss) attributable to Chubb$(864)$— $2,043 
For the Three Months Ended
September 30, 2022 (As Adjusted)
(in millions of U.S. dollars)		North America Commercial P&C Insurance North America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General Insurance Global
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb
Consolidated
Net premiums written$4,722 $1,392 $1,723 $2,645 $265 $1,265 $— $— $12,012 
Net premiums earned4,283 1,334 1,673 2,741 255 1,244 — — 11,530 
Losses and loss expenses3,036 857 1,444 1,333 311 27 74 (19)7,063 
Policy benefits— — — 108 — 666 — (67)707 
Policy acquisition costs583 274 68 720 59 266 — — 1,970 
Administrative expenses272 71 3 264 8 174 91 — 883 
Underwriting income (loss)392 132 158 316 (123)111 (165)86 907 
Net investment income
589 76 9 151 71 147 5 (69)979 
Other (income) expense6 1 1 (2)— 4 194 (2)202 
Amortization expense of
   purchased intangibles		— 2 7 12 — 2 46 — 69 
Segment income (loss)$975 $205 $159 $457 $(52)$252 $(400)$19 $1,615 
Net realized gains (losses)(437)(19)(456)
Market risk benefits gains (losses)69 — 69 
Interest expense150 — 150 
Cigna integration expenses23 — 23 
Income tax expense263 — 263 
Net income (loss)$(1,204)$— $792 

For the Nine Months Ended
September 30, 2023
(in millions of U.S. dollars) 		North America Commercial P&C InsuranceNorth America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General InsuranceGlobal
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb Consolidated
Net premiums written$14,575 $4,404 $2,581 $9,359 $831 $4,015 $— $— $35,765 
Net premiums earned13,710 4,084 2,334 9,005 720 3,962 — — 33,815 
Losses and loss expenses8,625 2,634 2,003 4,139 319 87 133 (3)17,937 
Policy benefits— — — 338 — 2,283 — (56)2,565 
Policy acquisition costs1,867 836 128 2,286 196 829 — — 6,142 
Administrative expenses934 247 9 899 27 553 290 — 2,959 
Underwriting income (loss)2,284 367 194 1,343 178 210 (423)59 4,212 
Net investment income2,204 262 43 636 144 525 28 (276)3,566 
Other (income) expense18 2 — (29)(1)(69)(251)(220)(550)
Amortization expense of
   purchased intangibles		— 8 19 52 — 18 129 — 226 
Segment income (loss)$4,470 $619 $218 $1,956 $323 $786 $(273)$3 $8,102 
Net realized gains (losses)(481)(3)(484)
Market risk benefits gains (losses)(154)— (154)
Interest expense499 — 499 
Cigna integration expenses51 — 51 
Income tax expense1,189 — 1,189 
Net income (loss)$(2,647)$— $5,725 
Net loss attributable to noncontrolling interests
(3)— (3)
Net income (loss) attributable to Chubb$(2,644)$— $5,728 
For the Nine Months Ended
September 30, 2022 (As Adjusted)
(in millions of U.S. dollars)		North America Commercial P&C Insurance North America Personal P&C InsuranceNorth America Agricultural InsuranceOverseas General Insurance Global
Reinsurance		Life InsuranceCorporateSegment Measure ReclassChubb
Consolidated
Net premiums written$13,426 $3,998 $2,523 $8,364 $780 $2,403 $— $— $31,494 
Net premiums earned12,645 3,852 2,217 8,065 712 2,325 — — 29,816 
Losses and loss expenses7,979 2,343 1,830 3,772 565 78 275 (9)16,833 
Policy benefits— — — 282 — 1,275 — (116)1,441 
Policy acquisition costs1,701 792 111 2,096 178 537 — — 5,415 
Administrative expenses814 213 4 811 27 346 264 — 2,479 
Underwriting income (loss)2,151 504 272 1,104 (58)89 (539)125 3,648 
Net investment income (loss)1,600 199 23 460 232 359 (4)(180)2,689 
Other (income) expense12 3 1 3 1 (38)73 (64)(9)
Amortization expense of
   purchased intangibles		— 7 20 40 — 7 137 — 211 
Segment income (loss)$3,739 $693 $274 $1,521 $173 $479 $(753)$9 $6,135 
Net realized gains (losses)(927)(9)(936)
Market risk benefits gains (losses)85 — 85 
Interest expense416 — 416 
Cigna integration expenses26 — 26 
Income tax expense907 — 907 
Net income (loss)$(2,944)$— $3,935 

Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Future policy benefits, Reinsurance recoverables, DAC, VOBA, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.