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DEBT AND FINANCIING ARRANGEMENTS (DETAILS 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Letter of Credit Facility [Member] | Citibank [Member]  
Line of Credit Facility [Line Items]  
Maximum capacity $ 750us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_CitibankMember
Termination notice requirement for lender after agreed date 30 days
Letters of credit outstanding 423us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_CitibankMember
Letter of Credit Facility [Member] | ING [Member]  
Line of Credit Facility [Line Items]  
Maximum capacity 0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_INGMember
Credit Facility [Member] | Syndication of Lenders [Member]  
Line of Credit Facility [Line Items]  
Maximum capacity 250us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_SyndicationOfLendersMember
Potential increase in maximum capacity 150axs_LineOfCreditFacilityMaximumBorrowingCapacityPotentialIncrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_SyndicationOfLendersMember
Letters of credit outstanding 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_SyndicationOfLendersMember
Credit facility borrowings $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= axs_SyndicationOfLendersMember