INVESTMENTS - Schedule of Proceeds and Split Between Gross Gains and Losses, from Dispositions of Fixed Maturity Securities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of fixed maturity securities - available for sale	$ 402	$ 653	$ 1,485	$ 933
Gross gains from sales	9	34	36	43
Gross losses from sales	(18)	(69)	(63)	(91)
Proceeds from sales of fixed maturity securities - held to maturity	0	0	0	10
Gross gains from sales	0	0	0	0
Gross losses from sales	0	0	0	(1)	$ (1)
Proceeds from sales of equity securities	36	1	36	55
Gross gains from sales	1	0	1	0
Gross losses from sales	$ (1)	$ 0	$ (1)	$ (1)

Debt Security, Held-To-Maturity, Sold, Realized Gain

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Debt Security, Held-To-Maturity, Sold, Realized Loss

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

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