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RELATED PARTY TRANSACTIONS (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2012 security	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Unfunded commitments related to other investments	$ 123us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments		$ 168us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Percentage ownership by related parties	45.00%axs_OrdinarySharesOutstandingHeldByRelatedPartiesPercentage
Blackstone Debt Advisors L.P. [Member]
Related Party Transaction [Line Items]
Number of CLO investments where related party is collateral manager		4axs_RelatedPartyTransactionsNumberOfCollateralizedLoanObligationInvestmentsRelatedPartyCollateralManager / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_BlackstoneDebtAdvisorsMember
Blackstone Alternative Asset Management L.P. [Member]
Related Party Transaction [Line Items]
Number of hedge fund investments where related party is manager		2axs_RelatedPartyTransactionNumberOfHedgeFundInvestmentsRelatedPartyManager / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_BlackstoneAlternativeAssetManagementMember
Blackstone Group [Member]
Related Party Transaction [Line Items]
Fees paid to related party		1us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_BlackstoneGroupMember
Stone Point Group [Member]
Related Party Transaction [Line Items]
Fees paid to related party	4us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_StonePointGroupMember		2us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_StonePointGroupMember	2us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_StonePointGroupMember
NXT Capital [Member]
Related Party Transaction [Line Items]
Fees paid to related party	1us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_NXTCapitalMember
Unfunded commitments related to other investments	30us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axs_NXTCapitalMember
Chairman [Member]
Related Party Transaction [Line Items]
Fees paid to related party	$ 1us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember		$ 1us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember	$ 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember

X

- Definition

Percentage of NXT Capital's ordinary shares outstanding held by Stone Point Capital.

+ References

No definition available.

+ Details

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X

- Definition

The number of hedge fund investments where the fund is managed by a related party.

+ References

No definition available.

+ Details

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X

- Definition

The number of collateralized loan obligation investments where the collateral manager is a related party.

+ References

No definition available.

+ Details

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X

- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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