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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities: |  |
Carrying Value | $ 0 | $ 576
Equity securities: |  |
Cost | 826 | 793
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (585) | (612)
Carrying Value | 500 | 440
Short-term Investments |  |
Debt securities: |  |
Cost |  | 580
Gross Unrealized Gains /Upward Adjustments |  | 0
Gross Unrealized Losses /Downward Adjustments |  | (4)
Carrying Value |  | 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: |  |
Cost | 715 | 715
Gross Unrealized Gains /Upward Adjustments | 0 | 0
Gross Unrealized Losses /Downward Adjustments | (360) | (404)
Carrying Value | 355 | 311
Equity securities of private entities | Long-term Investments |  |
Equity securities: |  |
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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