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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Long-term investments: |  |
Cost | $ 826 | $ 793
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (549) | (612)
Carrying Value | 536 | 440
Short-term investments, cost |  | 580
Short-term investments, gross unrealized gain |  | 0
Short-term investments, gross unrealized loss |  | (4)
Short-Term Investments | 0 | 576
International government securities | Short-term Investments |  |
Debt securities: |  |
Cost |  | 63
Gross Unrealized Gains /Upward Adjustments |  | 0
Gross Unrealized Losses /Downward Adjustments |  | 0
Carrying Value |  | 63
U.S. government securities | Short-term Investments |  |
Debt securities: |  |
Cost |  | 152
Gross Unrealized Gains /Upward Adjustments |  | 0
Gross Unrealized Losses /Downward Adjustments |  | (1)
Carrying Value |  | 151
Corporate debt securities | Short-term Investments |  |
Debt securities: |  |
Cost |  | 365
Gross Unrealized Gains /Upward Adjustments |  | 0
Gross Unrealized Losses /Downward Adjustments |  | (3)
Carrying Value |  | 362
Equity securities with readily determinable fair values | Long-term Investments |  |
Equity securities with readily determinable fair values |  |
Cost | 715 | 715
Gross Unrealized Gains /Upward Adjustments | 0 | 0
Gross Unrealized Losses /Downward Adjustments | (324) | (404)
Carrying Value | 391 | 311
Equity securities of private entities | Long-term Investments |  |
Equity securities of private entities |  |
Cost | 111 | 78
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (225) | (208)
Carrying Value | $ 145 | $ 129

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