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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities: |  |
Cost | $ 363 | $ 580
Gross Unrealized Gains /Upward Adjustments | 0 | 0
Gross Unrealized Losses /Downward Adjustments | (1) | (4)
Carrying Value | 362 | 576
Equity securities: |  |
Cost | 812 | 793
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (628) | (612)
Carrying Value | 443 | 440
Short-term Investments |  |
Debt securities: |  |
Cost | 363 | 580
International government securities | Short-term Investments |  |
Debt securities: |  |
Cost | 41 | 63
Gross Unrealized Gains/Upward Adjustments | 0 | 0
Gross Unrealized Losses/Downward Adjustments | 0 | 0
Carrying Value | 41 | 63
U.S. government securities | Short-term Investments |  |
Debt securities: |  |
Cost | 106 | 152
Gross Unrealized Gains/Upward Adjustments | 0 | 0
Gross Unrealized Losses/Downward Adjustments | 0 | (1)
Carrying Value | 106 | 151
Corporate debt securities | Short-term Investments |  |
Debt securities: |  |
Cost | 216 | 365
Gross Unrealized Gains/Upward Adjustments | 0 | 0
Gross Unrealized Losses/Downward Adjustments | (1) | (3)
Carrying Value | 215 | 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 | (420) | (404)
Carrying Value | 295 | 311
Equity securities of private entities | Long-term Investments |  |
Equity securities: |  |
Cost | 97 | 78
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (208) | (208)
Carrying Value | $ 148 | $ 129

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