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SHARE-BASED COMPENSATION (DETAILS 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restricted Stock And Restricted Stock Units RSU [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Granted (number) 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
Weighted average grant date fair value - granted $ 44.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 39.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 32.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
Share based compensation expense incurred $ 73,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 57,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 68,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
Tax benefit related to share-based compensation costs incurred 14,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
10,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
8,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
Number of restricted stock and restricted stock units granted which will settle in cash 1,018,083axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
847,425axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
 
Liability for cash-settled units 21,000,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
9,000,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
 
Service Based Restricted Stock And Restricted Stock Units [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Nonvested restricted stock (number) - beginning of period 3,430,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Granted (number) 1,053,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Vested (number) (1,474,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Forfeited (number) (241,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Nonvested restricted stock (number) - end of period 2,768,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Weighted average grant date fair value - beginning of period $ 34.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Weighted average grant date fair value - granted $ 44.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Weighted average grant date fair value - vested $ 33.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Weighted average grant date fair value - forfeited $ 36.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Weighted average grant date fair value - end of period $ 38.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
   
Accelerated and incremental share-based compensation expense related to senior leadership transitions     $ 20,000,000axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationIncrementalCompensationCostAndAcceleratedCompensationCost
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
Number of employees impacted by restricted stock award modifications during the period     1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
Performance Based Restricted Stock and Restricted Stock Units [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Nonvested restricted stock (number) - beginning of period 283,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Granted (number) 68,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Vested (number) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Forfeited (number) (4,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Nonvested restricted stock (number) - end of period 347,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value - beginning of period $ 35.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value - granted $ 44.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value - vested $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value - forfeited $ 44.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted average grant date fair value - end of period $ 37.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember