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Commitments and Contingencies (Details) - USD ($) $ in Billions	Mar. 31, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Investment commitments	$ 4.4	$ 4.4

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- Definition

Investment commitments primarily related to agreements entered into by the Company to invest in funds and separately managed accounts when called upon.

+ References

No definition available.

+ Details

Name:	acgl_InvestmentCommitments
Namespace Prefix:	acgl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration