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COMMITMENTS AND CONTINGENCIES (DETAILS 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Unrecorded Unconditional Purchase Obligation [Line Items]    
Unfunded commitments related to other investments $ 123us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments $ 168us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Minimum reinsurance premiums [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Outstanding purchase commitment 78us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= axs_MinimumreinsurancepremiumsMember
 
Outstanding purchase commitment, due in 2015 67us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= axs_MinimumreinsurancepremiumsMember
 
Outstanding purchase commitment, due in 2016 11us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= axs_MinimumreinsurancepremiumsMember
 
Fixed Maturities [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Outstanding purchase commitment $ 25us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_FixedMaturitiesMember