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SHARE-BASED COMPENSATION (DETAILS) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2012 | May 31, 2009 | May 31, 2007 | Feb. 11, 2015
Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted | 1,121,066 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | 1,007,425 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | 2,447,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember |  |  |  |
Number of restricted stock granted which will settle in cash | 1,018,083 axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | 847,425 axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember |  |  |  |  |
Fair value of restricted stock and cash settled awards vested | $ 68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | $ 70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | $ 43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember |  |  |  |
Unrecognized compensation costs | $ 112 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember | $ 98 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember |  |  |  |  |
Weighted average period for recognition of share based compensation | 2 years 102 days | 2 years 164 days |  |  |  |  |
Service Based Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted | 1,053,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember |  |  |  |  |  |
Performance Based Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted | 68,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Additional shares authorized for issuance under plan |  |  |  | 6,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember | 4,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember |
Maximum number of shares to be issued under the plan | 15,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember |  |  |  |  |  |
Number of awards available for grant under plan | 5,868,286 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Period of time subsequent to a change in control during which plan allows for accelerated vesting of awards for certain terminations | 2 years |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock granted which will settle in cash |  |  |  |  |  |  | 485,784 axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodToBeSettledInCash / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Annual award vesting percentage | 25.00%axs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantDateAnniversaryVestingRightsPercentage / us-gaap_AwardTypeAxis = axs_RestrictedStockAndRestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember / us-gaap_VestingAxis = axs_GradedVestingMember |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  |  |  | 977,253 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = axs_ServiceBasedRestrictedStockAndRestrictedStockUnitsMember / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Cliff Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
General award vesting period | 3 years |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
General award vesting period | 4 years |  |  |  |  |  |
2007 Long-term Equity Compensation Plan [Member] | Performance Based Restricted Stock and Restricted Stock Units [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  |  |  | 78,441 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = axs_A2007LongTermEquityCompensationPlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
2003 Long-term Equity Compensation Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiry date from date of grant | 10 years |  |  |  |  |  |

X
- Definition The portion of an award (on the anniversary of each grant date) that is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. + References No definition available. + Details
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- Definition The number of grants made during the period other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) which will be settled in cash. + References No definition available. + Details
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- Definition The term to expiry for options, measured from the date of grant. + References No definition available. + Details
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- Definition The period subsequent to a change in control of the entity during which the vesting of share-based payment awards would be accelerated for certain terminations. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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