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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share, Basic And Diluted |
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
(in millions of U.S. dollars, except share and per share data) | 2025 |  | 2024 |  | 2025 |  | 2024
Numerator: |  |  |  |  |  |  |
Net income | $ | 3,107 |  |  | $ | 2,490 |  |  | $ | 7,449 |  |  | $ | 7,000 |
Net income (loss) attributable to noncontrolling interests | 306 |  |  | 166 |  |  | 349 |  |  | 303 |
Net income attributable to Chubb | $ | 2,801 |  |  | $ | 2,324 |  |  | $ | 7,100 |  |  | $ | 6,697 |
Denominator: |  |  |  |  |  |  |
Denominator for basic earnings per share attributable to Chubb: |  |  |  |  |  |  |
Weighted-average shares outstanding | 397,336,568 |  |  | 403,831,412 |  |  | 399,289,363 |  |  | 404,700,118 |
Denominator for diluted earnings per share attributable to Chubb: |  |  |  |  |  |  |
Share-based compensation plans | 3,532,323 |  |  | 4,047,315 |  |  | 3,902,807 |  |  | 4,191,655 |
Weighted-average shares outstanding and assumed conversions | 400,868,891 |  |  | 407,878,727 |  |  | 403,192,170 |  |  | 408,891,773 |
Basic earnings per share attributable to Chubb | $ | 7.05 |  |  | $ | 5.75 |  |  | $ | 17.78 |  |  | $ | 16.55 |
Diluted earnings per share attributable to Chubb | $ | 6.99 |  |  | $ | 5.70 |  |  | $ | 17.61 |  |  | $ | 16.38 |
Potential anti-dilutive share conversions | 1,631,069 |  |  | 1,330,590 |  |  | 1,819,681 |  |  | 1,080,371 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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