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NONCONTROLLING INTEREST (DETAILS) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2013	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Decrease from return of capital to noncontrolling interests		$ (10,000,000)us-gaap_MinorityInterestDecreaseFromRedemptions
Increase from issuance of preferred equity to noncontrolling interests		25,000,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Assets		19,955,736,000us-gaap_Assets	19,634,784,000us-gaap_Assets
Liabilities		14,075,796,000us-gaap_Liabilities	13,766,822,000us-gaap_Liabilities
Ventures Re [Member]
Noncontrolling Interest [Line Items]
Third party non-voting redeemable preferred share capital	50,000,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = axs_VenturesReMember
Decrease from return of capital to noncontrolling interests		(10,000,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = axs_VenturesReMember
Increase from issuance of preferred equity to noncontrolling interests		25,000,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = axs_VenturesReMember
Assets		97,000,000us-gaap_Assets / dei_LegalEntityAxis = axs_VenturesReMember	50,000,000us-gaap_Assets / dei_LegalEntityAxis = axs_VenturesReMember
Liabilities		$ 38,000,000us-gaap_Liabilities / dei_LegalEntityAxis = axs_VenturesReMember	$ 0us-gaap_Liabilities / dei_LegalEntityAxis = axs_VenturesReMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

+ References

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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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