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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
LIABILITIES: |  |  |  |  |  |  |  |
Impairment of investment | [1] | $ 0 | $ 0 |  | $ 0 | $ 100 |  |
Goodwill |  | 1,872 |  |  | 1,872 |  | $ 1,895 |
Impairment of goodwill |  | 0 | 573 |  | 0 | 1,062 |  |
OpenTable And KAYAK |  |  |  |  |  |  |  |
LIABILITIES: |  |  |  |  |  |  |  |
Goodwill |  |  | 1,000 | $ 1,500 |  | $ 1,000 |  |
Impairment of goodwill |  |  | $ 573 | 489 |  |  |  |
DiDi Global Inc. | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
LIABILITIES: |  |  |  |  |  |  |  |
Impairment of investment |  |  |  | 100 |  |  |  |
Recurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 14,859 |  |  | 14,859 |  | 14,054 |
Recurring Basis | Money market fund investments | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 11,074 |  |  | 11,074 |  | 10,208 |
Recurring Basis | Time deposits and certificates of deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 41 |  |  | 41 |  | 32 |
Recurring Basis | Investments in private company debt securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 330 |  |  | 330 |  | 200 |
Recurring Basis | Equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 2,884 |  |  | 2,884 |  | 3,080 |
Recurring Basis | Trip.com Group | Convertible Debt Securities | Short-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 522 |  |  | 522 |  | 501 |
Recurring Basis | Trip.com Group | Convertible Debt Securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 24 |
Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 8 |  |  | 8 |  | 9 |
LIABILITIES: |  |  |  |  |  |  |  |
Liabilities at fair value |  | 11 |  |  | 11 |  | 7 |
Nonrecurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 1,404 |
Nonrecurring Basis | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 18 |  |  | 18 |  | 404 | [2]
Nonrecurring Basis | Goodwill | OpenTable And KAYAK |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value | [3] |  |  |  |  |  | 1,000 |
Nonrecurring Basis | DiDi Global Inc. | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  | $ 400 |  |  |  |
Level 1 | Recurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 13,999 |  |  | 13,999 |  | 13,320 |
Level 1 | Recurring Basis | Money market fund investments | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 11,074 |  |  | 11,074 |  | 10,208 |
Level 1 | Recurring Basis | Time deposits and certificates of deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 41 |  |  | 41 |  | 32 |
Level 1 | Recurring Basis | Investments in private company debt securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 1 | Recurring Basis | Equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 2,884 |  |  | 2,884 |  | 3,080 |
Level 1 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Short-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 1 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 0 |
Level 1 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
LIABILITIES: |  |  |  |  |  |  |  |
Liabilities at fair value |  | 0 |  |  | 0 |  | 0 |
Level 1 | Nonrecurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 0 |
Level 1 | Nonrecurring Basis | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 | [2]
Level 1 | Nonrecurring Basis | Goodwill | OpenTable And KAYAK |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value | [3] |  |  |  |  |  | 0 |
Level 2 | Recurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 530 |  |  | 530 |  | 534 |
Level 2 | Recurring Basis | Money market fund investments | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 2 | Recurring Basis | Time deposits and certificates of deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 2 | Recurring Basis | Investments in private company debt securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 2 | Recurring Basis | Equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 2 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Short-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 522 |  |  | 522 |  | 501 |
Level 2 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 24 |
Level 2 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 8 |  |  | 8 |  | 9 |
LIABILITIES: |  |  |  |  |  |  |  |
Liabilities at fair value |  | 11 |  |  | 11 |  | 7 |
Level 2 | Nonrecurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 0 |
Level 2 | Nonrecurring Basis | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 18 |  |  | 18 |  | 0 | [2]
Level 2 | Nonrecurring Basis | Goodwill | OpenTable And KAYAK |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value | [3] |  |  |  |  |  | 0 |
Level 3 | Recurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 330 |  |  | 330 |  | 200 |
Level 3 | Recurring Basis | Money market fund investments | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 3 | Recurring Basis | Time deposits and certificates of deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 3 | Recurring Basis | Investments in private company debt securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 330 |  |  | 330 |  | 200 |
Level 3 | Recurring Basis | Equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 3 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Short-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
Level 3 | Recurring Basis | Trip.com Group | Convertible Debt Securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 0 |
Level 3 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | 0 |  |  | 0 |  | 0 |
LIABILITIES: |  |  |  |  |  |  |  |
Liabilities at fair value |  | 0 |  |  | 0 |  | 0 |
Level 3 | Nonrecurring Basis |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  |  |  |  |  |  | 1,404 |
Level 3 | Nonrecurring Basis | Investment in private company equity securities | Long-term Investments |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value |  | $ 0 |  |  | $ 0 |  | 404 | [2]
Level 3 | Nonrecurring Basis | Goodwill | OpenTable And KAYAK |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |
Assets at fair value | [3] |  |  |  |  |  | $ 1,000 |
[1] | See Note 5 for additional information related to the net (losses) gains on equity securities and impairment of investment.
[2] | At March 31, 2020, the investment in DiDi was written down to its estimated fair value of $400 million, resulting in an impairment charge of $100 million (see Note 5).
[3] | At March 31, 2020, the goodwill of the OpenTable and KAYAK reporting unit was written down to its estimated fair value of $1.5 billion, resulting in an impairment charge of $489 million. At September 30, 2020, the goodwill was further written down to its estimated fair value of $1.0 billion, resulting in an additional impairment charge of $573 million (see Note 8).

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