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INVESTMENTS - Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 26	$ 12
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal (as a percent)	102.00%

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- 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_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant