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INVESTMENTS (Reverse Repurchase Agreements) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 86	$ 37
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

X

- 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_
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Balance Type:	na
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- References

No definition available.

+ Details

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X

- 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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