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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2018	Dec. 31, 2024	Dec. 31, 2023
Effects of Reinsurance [Line Items]
Restricted cash		$ 397	$ 243
Mt Logan Re
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by group		100.00%
Retrocede amount	$ 269
Cash transferred	252
Mt Logan Re | Maximum
Effects of Reinsurance [Line Items]
Liability retroceded	$ 319

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Amount of liabilities, classified as other, assumed in acquiring a business or in consideration for an asset received in a noncash or part noncash acquisition.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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