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INVESTMENTS - Summary of Net Unrealized Gains and Losses on Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | $ (340) | $ (143) | $ (137) | $ 293
Fair Value Option Investments |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | (289) | (72) | (143) | 204
All Other Equity Investments |  |  |  |
Debt Securities, Available-for-Sale |  |  |  |
Total unrealized (gain) loss, net | $ (51) | $ (71) | $ 6 | $ 89

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