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INVESTMENTS - Reverse repurchase agreements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Value of reverse repurchase agreements | $ 0 | $ 189
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal | 102.00% |

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- Definition Minimum value of securities received as collateral against securities purchased under agreement to resell, expressed as a percentage of loan principal. + References No definition available. + Details
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Namespace Prefix: | axs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant