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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, 2023
Effects of Reinsurance [Line Items]
Catastrophe bond protection, threshold		$ 350
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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Catastrophe Bond Protection, Threshold

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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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