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Acquisitions (Pro forma) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Business Acquisition [Line Items] |  |  |  |
Net premiums earned | $ 12,292 | $ 10,999 | $ 23,875 | $ 21,141
Huatai Group | Pro Forma |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net premiums earned |  | 11,378 |  | 21,931
Total revenues |  | 12,305 |  | 23,834
Net income |  | 1,790 |  | 3,690
Net income attributable to Chubb |  | $ 1,785 |  | $ 3,675

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