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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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 80	$ 82	$ 250	$ 169
Ceded earned premiums	92	94	216	180
Ceded losses and LAE	0	26	121	64
Assumed written premiums	2	1	5	3
Assumed earned premiums	2	1	5	3
Assumed losses and LAE	$ 0	$ 0	$ 0	$ 0

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Amount of written premiums assumed from other entities.

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