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SHARE-BASED COMPENSATION (DETAILS) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2012
May 31, 2009
May 31, 2007
Feb. 11, 2015
Restricted Stock And Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted 1,121,066us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
1,007,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
2,447,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
       
Number of restricted stock granted which will settle in cash 1,018,083axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
847,425axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
         
Fair value of restricted stock and cash settled awards vested $ 68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
       
Unrecognized compensation costs $ 112us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 98us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
         
Weighted average period for recognition of share based compensation 2 years 102 days 2 years 164 days          
Service Based Restricted Stock And Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted 1,053,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
           
Performance Based Restricted Stock and Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted 68,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
           
2007 Long-term Equity Compensation Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Additional shares authorized for issuance under plan       6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
 
Maximum number of shares to be issued under the plan 15,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
           
Number of awards available for grant under plan 5,868,286us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
           
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Period of time subsequent to a change in control during which plan allows for accelerated vesting of awards for certain terminations 2 years            
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock granted which will settle in cash             485,784axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual award vesting percentage 25.00%axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantDateAnniversaryVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
/ us-gaap_VestingAxis
= axs_GradedVestingMember
           
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted             977,253us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Cliff Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
General award vesting period 3 years            
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
General award vesting period 4 years            
2007 Long-term Equity Compensation Plan [Member] | Performance Based Restricted Stock and Restricted Stock Units [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted             78,441us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= axs_A2007LongTermEquityCompensationPlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
2003 Long-term Equity Compensation Plan [Member] | Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiry date from date of grant 10 years