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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale
Amortized Cost	$ 1,987	$ 0
Gross Unrealized Gains	6
Gross Unrealized Losses	(1)
Estimated Fair Value	1,992
U.S. treasury securities
Debt Securities, Available-for-Sale
Amortized Cost	691
Gross Unrealized Gains	1
Gross Unrealized Losses	(1)
Estimated Fair Value	692
U.S. government agencies securities
Debt Securities, Available-for-Sale
Amortized Cost	10
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	10
Corporate debt securities
Debt Securities, Available-for-Sale
Amortized Cost	987
Gross Unrealized Gains	4
Gross Unrealized Losses	0
Estimated Fair Value	991
Residential mortgage and asset-backed securities
Debt Securities, Available-for-Sale
Amortized Cost	299
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Estimated Fair Value	$ 300

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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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