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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Schedule of Premiums and Losses Ceded (Details) - Mt Logan Re - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 115	$ 235	$ 365	$ 404
Ceded earned premiums	113	79	330	260
Ceded losses and LAE	13	44	135	107
Assumed written premiums	4	4	9	6
Assumed earned premiums	4	4	9	6
Assumed losses and LAE	$ 0	$ 0	$ 0	$ 0

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Amount of written premiums assumed from other entities.

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