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INCOME TAXES (DETAILS 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Singapore [Member]    
Income tax carryforwards [Line Items]    
Operating Loss Carryforwards $ 110us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InlandRevenueSingaporeIRASMember
$ 115us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InlandRevenueSingaporeIRASMember
Australia [Member]    
Income tax carryforwards [Line Items]    
Operating Loss Carryforwards 68us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= axs_AustraliaTaxAuthorityMember
45us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= axs_AustraliaTaxAuthorityMember
Europe [Member]    
Income tax carryforwards [Line Items]    
Foreign Tax Credit Carryforward 7us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityNameAxis
= axs_EuropeanTaxAuthoritiesMember
4us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityNameAxis
= axs_EuropeanTaxAuthoritiesMember
United States [Member]    
Income tax carryforwards [Line Items]    
Alternative minimum tax credit $ 8us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
$ 7us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember