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SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions	Oct. 26, 2025	Oct. 01, 2025	Sep. 30, 2025	Dec. 31, 2024
Subsequent Event [Line Items]
Funds held under reinsurance treaties			$ 16	$ 27
Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements
Subsequent Event [Line Items]
Funds held under reinsurance treaties			$ 5,400
Subsequent Event | First Layer | Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements
Subsequent Event [Line Items]
Funds held under reinsurance agreement, excess of liability		$ 700
In-the-money reserves, consideration to be transferred upon closing		1,300
Co-participation per layer		100
Subsequent Event | Second Layer | Reinsurance Contract [Axis]: Adverse Development Cover Reinsurance Agreements
Subsequent Event [Line Items]
Funds held under reinsurance agreement, excess of liability		500
In-the-money reserves, consideration to be transferred upon closing		122
Co-participation per layer		$ 100
Subsequent Event | American International Group, Inc.
Subsequent Event [Line Items]
Percentage of actual premiums written threshold	15.00%
Additional monthly consideration	$ 10
Additional monthly consideration, term	9 months
Subsequent Event | United States, United Kingdom, And Asia Pacific | American International Group, Inc.
Subsequent Event [Line Items]
Aggregate purchase price	$ 252
Master transaction agreement payment	$ 30
Aggregate renewed premiums	80.00%
Aggregate purchase price, not to exceed	$ 70
Subsequent Event | European Union | American International Group, Inc.
Subsequent Event [Line Items]
Aggregate purchase price	$ 49

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 830
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-Paragraph 2
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