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Commitments and Contingencies (Details) - USD ($) $ in Billions | Mar. 31, 2025 | Dec. 31, 2024
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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