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COMMITMENTS AND CONTINGENCIES - Cash and investments (Details) | Dec. 31, 2017
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Commitments and Contingencies Disclosure [Abstract] |
Fixed maturity portfolio - corporate issuer concentration limit above A- | 2.00%
Fixed maturity portfolio - corporate issuer concentration limit below A- | 1.00%

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 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
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Namespace Prefix: | axs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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