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Acquisitions (Pro forma) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Acquisition [Line Items] |  |  |  |
Net premiums earned | $ 13,373 | $ 12,674 | $ 37,248 | $ 33,815
Huatai Group | Pro Forma |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net premiums earned |  | 12,674 |  | 34,605
Total revenues |  | 13,755 |  | 37,589
Net income |  | 1,905 |  | 5,595
Net income attributable to Chubb |  | $ 1,912 |  | $ 5,587

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