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COMMITMENTS AND CONTINGENCIES (DETAILS) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Fixed maturity portfolio - corporate issuer concentration limit above A-	2.00%axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissueraminusorabovepercentageoffixedmaturityportfolio
Fixed maturity portfolio - corporate issuer concentration limit below A-	1.00%axs_Concentrationriskcreditriskfixedmaturitiesmaximumexposurecorporateissuerbelowaminuspercentageoffixedmaturityportfolio
Premiums receivable allowance for doubtful accounts	$ 4us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts	$ 3us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts

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

- Details

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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=35738203&loc=d3e5074-111524



Reference 2: 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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 7



Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

+ Details

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