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INVESTMENTS - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale
Amortized Cost		$ 3,033
Gross Unrealized Gains		11
Gross Unrealized Losses		(1)
Estimated Fair Value		3,044
U.S. treasury securities
Debt Securities, Available-for-Sale
Amortized Cost		1,222
Gross Unrealized Gains		3
Gross Unrealized Losses		0
Estimated Fair Value	$ 0	1,224
U.S. government agencies securities
Debt Securities, Available-for-Sale
Amortized Cost		15
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value	0	15
Corporate debt securities
Debt Securities, Available-for-Sale
Amortized Cost		1,392
Gross Unrealized Gains		7
Gross Unrealized Losses		0
Estimated Fair Value	0	1,398
Residential mortgage and asset-backed securities
Debt Securities, Available-for-Sale
Amortized Cost		405
Gross Unrealized Gains		2
Gross Unrealized Losses		0
Estimated Fair Value	$ 0	$ 407

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- 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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