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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions |  | 6 Months Ended
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Mar. 01, 2021 | Jun. 30, 2021
Statement of Cash Flows [Abstract] |  |
Fair value of securities transferred from available for sale to fixed maturities, held to maturity | $ 405 | $ 405

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- Definition Transfer To Investments, Available For Sale To Fixed Maturities + References No definition available. + Details
Name: | axs_TransferToInvestmentsAvailableForSaleToFixedMaturities
Namespace Prefix: | axs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration