CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions		6 Months Ended
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

Transfer To Investments, Available For Sale To Fixed Maturities

No definition available.

Name:	axs_TransferToInvestmentsAvailableForSaleToFixedMaturities
Namespace Prefix:	axs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration