INVESTMENTS - Schedule of Proceeds and Split Between Gross Gains and Losses, from Dispositions of Fixed Maturity Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of fixed maturity securities - available for sale	$ 519	$ 127
Gross gains from sales	14	5
Gross losses from sales	(30)	(9)
Proceeds from sales of fixed maturity securities - held to maturity	0	10
Gross gains from sales	0	0
Gross losses from sales	0	(1)	$ (1)
Proceeds from sales of equity securities	0	50
Gross gains from sales	0	0
Gross losses from sales	$ 0	$ 0

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
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-Paragraph 9
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-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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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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