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v3.24.0.1

Short Duration Contracts (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($)
Mortgage |
Claims Development [Line Items] |
Large claim size threshold | $ 250,000

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- Definition Short Duration Contracts, Large Claim Size Threshold + References No definition available. + Details
Name: | acgl_ShortDurationContractsLargeClaimSizeThreshold
Namespace Prefix: | acgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClaimsDevelopmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=acgl_MortgageSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |