INVESTMENTS - Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 34	$ 543
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal (as a percent)	102.00%

Minimum value of securities received as collateral against securities purchased under agreement to resell, expressed as a percentage of loan principal.

No definition available.

Name:	axs_SecuritiesPurchasedUnderAgreementsToResellRequiredCollateralPercentageOfPrincipal
Namespace Prefix:	axs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant