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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Long-term investments: |  |
Carrying Value | $ 2,381 | $ 3,175
Short-term Investments | Debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Cost | 25 | 25
Gross Unrealized Gains/Upward Adjustments | 0 | 0
Gross Unrealized Losses/Downward Adjustments | 0 | 0
Carrying Value | 25 | 25
Long-term investments |  |
Long-term investments: |  |
Cost | 1,243 | 1,231
Gross Unrealized Gains /Upward Adjustments | 1,802 | 2,249
Gross Unrealized Losses /Downward Adjustments | (664) | (305)
Carrying Value | 2,381 | 3,175
Long-term investments | Investment in private company equity securities |  |
Equity security investments in private companies: |  |
Cost | 78 | 66
Gross Unrealized Gains /Upward Adjustments | 259 | 259
Gross Unrealized Losses /Downward Adjustments | (184) | 0
Carrying Value | 153 | 325
Long-term investments | Equity securities with readily determinable fair values |  |
Equity security investments with readily determinable fair value: |  |
Cost | 1,165 | 1,165
Gross Unrealized Gains /Upward Adjustments | 1,543 | 1,990
Gross Unrealized Losses /Downward Adjustments | (480) | (305)
Carrying Value | $ 2,228 | $ 2,850

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