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COMMITMENTS AND CONTINGENCIES (DETAILS) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
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%
Total cash and invested assets - corporate issuer concentration	1.50%
Premiums receivable allowance for doubtful accounts	$ 3	$ 4

X

- Definition

Reflects the maximum amount, expressed as a percentage of total cash and invested assets, of concentration of credit risk to any single corporate issuer.

+ References

No definition available.

+ Details

Name:	axs_ConcentrationRiskCreditRiskMaximumExposureCorporateIssuerPercentageOfTotalCashAndInvestedAssets
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 A- or above (excluding U.S. government and agency securities).

+ References

No definition available.

+ Details

Name:	axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissueraminusorabovepercentageoffixedmaturityportfolio
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

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=49124121&loc=d3e5074-111524

Reference 2: 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 3: 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

+ Details

Name:	us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant