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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum |
Claims Development [Line Items] |
Development for an accident year or underwriting year, recognition period | 1 year
Maximum |
Claims Development [Line Items] |
Development for an accident year or underwriting year, recognition period | 3 years

X
- Definition Development For an Accident Year or Underwriting Year, Recognition Period + References No definition available. + Details
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Namespace Prefix: | axs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClaimsDevelopmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |