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COMMITMENTS AND CONTINGENCIES (DETAILS) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments and Contingencies Disclosure [Abstract] |  |
Fixed maturity portfolio - corporate issuer concentration limit above A- | 2.00%axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissueraminusorabovepercentageoffixedmaturityportfolio |
Fixed maturity portfolio - corporate issuer concentration limit below A- | 1.00%axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissuerbelowaminuspercentageoffixedmaturityportfolio |
Premiums receivable allowance for doubtful accounts | $ 4 us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 3 us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts

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- Definition Reflects the maximum amount, expressed as a percentage of fixed maturity value, of concentration of credit risk to any single corporate debt issuer rated A- or above (excluding U.S. government and agency securities). + References No definition available. + Details
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Namespace Prefix: | axs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reflects the maximum amount, expressed as a percentage of fixed maturity value, of concentration of credit risk to any single corporate debt issuer rated below A- (excluding U.S. government and agency securities). + References No definition available. + Details
Name: | axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissuerbelowaminuspercentageoffixedmaturityportfolio
Namespace Prefix: | axs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant