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Investment Information - Restricted assets (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Restricted Assets [Line Items]
Restricted assets		$ 9,739	$ 9,932
Collateral or guarantees - affiliated transactions
Restricted Assets [Line Items]
Restricted assets		4,874	4,854
Collateral or guarantees - third party agreements
Restricted Assets [Line Items]
Restricted assets		2,694	2,869
Deposits with US regulatory authorities
Restricted Assets [Line Items]
Restricted assets		828	833
Other
Restricted Assets [Line Items]
Restricted assets	[1]	$ 1,343	$ 1,376
[1] Primarily includes Funds at Lloyds, deposits with non-U.S. regulatory authorities and other restricted assets

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- Definition

Assets, consisting primarily of fixed maturities, that the Company is required to maintain with various regulatory authorities to support its insurance and reinsurance operations. The Company's insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties.

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No definition available.

+ Details

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

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- Definition

-- None. No documentation exists for this element. --

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No definition available.

+ Details

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Period Type:	duration

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- Details

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X

- Details

Name:	acgl_RestrictedAssetsRestrictionTypeAxis=acgl_CollateralOrGuaranteesThirdPartyAgreementsMember
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X

- Details

Name:	acgl_RestrictedAssetsRestrictionTypeAxis=acgl_DepositsWithUsRegulatoryAuthoritiesMember
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X

- Details

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Namespace Prefix:
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