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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt securities: |  |  |  |
Cost |  | $ 363 | $ 176 |
Gross Unrealized Gains /Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses /Downward Adjustments |  | (4) | (1) |
Carrying Value |  | 359 | 175 |
Equity securities: |  |  |  |
Cost |  | 1,167 | 1,819 |
Gross Unrealized Gains /Upward Adjustments |  | 259 | 1,611 |
Gross Unrealized Losses /Downward Adjustments |  | (620) | (641) |
Carrying Value |  | 806 | 2,789 |
Short-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 363 | 176 |
Long-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 374 | 576 |
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments |  | (6) | (11) |
Carrying Value |  | 368 | 565 |
Equity securities: |  |  |  |
Cost |  | 793 | 1,243 |
Gross Unrealized Gains /Upward Adjustments |  | 259 | 1,611 |
Gross Unrealized Losses /Downward Adjustments |  | (614) | (630) |
Carrying Value |  | 438 | 2,224 |
International government securities | Short-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 38 | 13 |
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments |  | 0 | 0 |
Carrying Value |  | 38 | 13 |
International government securities | Long-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 41 | 63 |
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments |  | (1) | (1) |
Carrying Value |  | 40 | 62 |
U.S. government securities | Short-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost | [1] | 145 | 131 |
Gross Unrealized Gains/Upward Adjustments | [1] | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments | [1] | (1) | (1) |
Carrying Value | [1] | 144 | 130 |
U.S. government securities | Long-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 113 | 147 | [1]
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 | [1]
Gross Unrealized Losses/Downward Adjustments |  | (2) | (3) | [1]
Carrying Value |  | 111 | 144 | [1]
Corporate debt securities | Short-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 180 | 32 |
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments |  | (3) | 0 |
Carrying Value |  | 177 | 32 |
Corporate debt securities | Long-term Investments |  |  |  |
Debt securities: |  |  |  |
Cost |  | 220 | 366 |
Gross Unrealized Gains/Upward Adjustments |  | 0 | 0 |
Gross Unrealized Losses/Downward Adjustments |  | (3) | (7) |
Carrying Value |  | 217 | 359 |
Equity securities with readily determinable fair values | Long-term Investments |  |  |  |
Equity securities: |  |  |  |
Cost |  | 715 | 1,165 |
Gross Unrealized Gains /Upward Adjustments |  | 0 | 1,352 |
Gross Unrealized Losses /Downward Adjustments |  | (430) | (446) |
Carrying Value |  | 285 | 2,071 |
Equity securities of private companies | Long-term Investments |  |  |  |
Equity securities: |  |  |  |
Cost |  | 78 | 78 |
Gross Unrealized Gains /Upward Adjustments |  | 259 | 259 |
Gross Unrealized Losses /Downward Adjustments |  | (184) | (184) |
Carrying Value |  | $ 153 | $ 153 |
[1] | Includes investments in U.S. municipal bonds.

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