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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions		3 Months Ended
	Mar. 01, 2021	Mar. 31, 2021
Statement of Cash Flows [Abstract]
Available for sale to fixed maturities, held to maturity fair value	$ 405	$ 405

X

- 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