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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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Business Acquisition, Pro Forma Net income (loss), Including Portion Attributable to Noncontrolling Interests

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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