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INVESTMENTS - Schedule of Changes in Net Unrealized Appreciation (Depreciation) for Company's Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities - available for sale and short-term investments	$ (203)	$ 1,129
Equity method investments	18	0
Change in URA(D), pre-tax	(185)	1,129
Deferred tax benefit (expense)	76	(142)
Total URA(D) on securities arising during the period	$ (109)	$ 986

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Amount, before tax, of other comprehensive income (loss) (OCI) for proportionate share of equity method investee's OCI.

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Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount, after adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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