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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Schedule of Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Collateral in trust for non-affiliated or affiliated agreements	$ 3,241	$ 3,208
Collateral for secured letter of credit facilities	1,386	1,438
Collateral for FHLB borrowings	1,294	1,077
Securities on deposit with or regulated by government authorities	1,406	1,447
Funds at Lloyd's	341	538
Funds held by reinsureds	1,218	1,135
Total restricted assets	$ 8,885	$ 8,843

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Funds Held In Financial Institution

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Name Accounting Standards Codification
-Section S99
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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Name Accounting Standards Codification
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The amount of securities on deposit with clearing organizations and other entities which provide services necessary to operations of the Company. This item would include, for instance, securities advanced as refundable collateral for securities borrowed.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
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