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COMMITMENTS AND CONTINGENCIES (DETAILS) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Minimum reinsurance premiums [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Outstanding purchase commitment | $ 72 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = axs_MinimumreinsurancepremiumsMember
Outstanding purchase commitment, due in 2015 | 64 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = axs_MinimumreinsurancepremiumsMember
Outstanding purchase commitment, due in 2016 | 8 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = axs_MinimumreinsurancepremiumsMember
Commercial mortgage loans [Member] |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Outstanding purchase commitment | $ 50 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = us-gaap_MortgageLoansOnRealEstateMember

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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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Period Type: | instant

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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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Period Type: | instant

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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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Period Type: | instant

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- Details
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- Details
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |