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SHARE-BASED COMPENSATION (DETAILS) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]    
Share based compensation expense incurred $ 19,000,000us-gaap_AllocatedShareBasedCompensationExpense $ 17,000,000us-gaap_AllocatedShareBasedCompensationExpense
Tax benefit related to share-based compensation costs incurred 4,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 3,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Fair value - vested during period 63,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 61,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Unrecognized share-based compensation costs 148,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Unrecognized share-based compensation costs - weighted average period expected to be recognized 2 years 7 months 24 days  
Performance Shares [Member]    
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]    
Nonvested restricted stock (number) - beginning of period 347,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Granted (number) 60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Vested (number) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Forfeited (number) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Nonvested restricted stock (number) - end of period 407,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]    
Weighted average grant date fair value - beginning of period $ 37.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted average grant date fair value - granted $ 51.31us-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 $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted average grant date fair value - end of period $ 39.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Number of restricted stock and restricted stock units granted which will settle in cash 18,659axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Service Based Restricted Stock And Restricted Stock Units [Member]    
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]    
Nonvested restricted stock (number) - beginning of period 2,768,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Granted (number) 511,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Vested (number) (984,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Forfeited (number) (17,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Nonvested restricted stock (number) - end of period 2,278,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]    
Weighted average grant date fair value - beginning of period $ 38.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Weighted average grant date fair value - granted $ 51.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Weighted average grant date fair value - vested $ 36.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Weighted average grant date fair value - forfeited $ 41.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Weighted average grant date fair value - end of period $ 42.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Number of restricted stock and restricted stock units granted which will settle in cash 467,849axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember
 
Restricted Stock And Restricted Stock Units RSU [Member]    
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]    
Number of restricted stock and restricted stock units granted which will settle in cash 486,508axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
 
Liability for cash-settled units $ 13,000,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember
$ 5,000,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= axs_RestrictedStockAndRestrictedStockUnitsRSUMember