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INVESTMENTS - Schedule of Changes in Net Unrealized Appreciation (Depreciation) for the Company's Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items]
Change in URA(D), pre-tax	$ 857	$ (264)	$ 581	$ (180)
Deferred tax benefit (expense)	(123)	22	(60)	20
Total URA(D) of securities arising during the period	734	(242)	521	(159)
Fixed maturity securities - available for sale and short-term investments
Debt Securities, Available-for-Sale [Line Items]
Change in URA(D), pre-tax	840	(264)	563	(180)
Equity securities
Debt Securities, Available-for-Sale [Line Items]
Change in URA(D), pre-tax	$ 18	$ 0	$ 18	$ 0

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- Definition

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 tax and 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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