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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Net Unrealized Gains and Losses on Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | $ (494) | $ (257) | $ (201) | $ 155
Fair Value Option Investments |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | (312) | (68) | (108) | 341
All Other Equity Investments |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | $ (182) | $ (188) | $ (93) | $ (186)

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