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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Recurring Basis | Money Market Funds and Certificates of Deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |
ASSETS: |  |  |
Assets at fair value | [1] | $ 15,212 | $ 14,926
Recurring Basis | Equity securities with readily determinable fair values |  |  |
ASSETS: |  |  |
Assets at fair value |  | 507 | 391
Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |
ASSETS: |  |  |
Assets at fair value |  | 30 | 70
LIABILITIES: |  |  |
Liabilities at fair value |  | 36 | 93
Recurring Basis | Not Designated as Hedging Instrument | Embedded derivative liability |  |  |
LIABILITIES: |  |  |
Liabilities at fair value |  |  | 1,300
Nonrecurring Basis | Long-lived assets (2) | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value | [2] | 179 |
Nonrecurring Basis | Goodwill | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value | [2] | 203 |
Level 1 | Recurring Basis | Money Market Funds and Certificates of Deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |
ASSETS: |  |  |
Assets at fair value | [1] | 15,212 | 14,926
Level 1 | Recurring Basis | Equity securities with readily determinable fair values |  |  |
ASSETS: |  |  |
Assets at fair value |  | 507 | 391
Level 1 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
LIABILITIES: |  |  |
Liabilities at fair value |  | 0 | 0
Level 1 | Recurring Basis | Not Designated as Hedging Instrument | Embedded derivative liability |  |  |
LIABILITIES: |  |  |
Liabilities at fair value |  |  | 0
Level 1 | Nonrecurring Basis | Long-lived assets (2) | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 |
Level 1 | Nonrecurring Basis | Goodwill | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 |
Level 2 | Recurring Basis | Money Market Funds and Certificates of Deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
Level 2 | Recurring Basis | Equity securities with readily determinable fair values |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
Level 2 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |
ASSETS: |  |  |
Assets at fair value |  | 30 | 70
LIABILITIES: |  |  |
Liabilities at fair value |  | 36 | 93
Level 2 | Recurring Basis | Not Designated as Hedging Instrument | Embedded derivative liability |  |  |
LIABILITIES: |  |  |
Liabilities at fair value |  |  | 1,300
Level 2 | Nonrecurring Basis | Long-lived assets (2) | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 |
Level 2 | Nonrecurring Basis | Goodwill | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 |
Level 3 | Recurring Basis | Money Market Funds and Certificates of Deposit | Cash Equivalents and Restricted Cash Equivalents |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Recurring Basis | Equity securities with readily determinable fair values |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
Level 3 | Recurring Basis | Not Designated as Hedging Instrument | Foreign currency exchange derivatives |  |  |
ASSETS: |  |  |
Assets at fair value |  | 0 | 0
LIABILITIES: |  |  |
Liabilities at fair value |  | 0 | 0
Level 3 | Recurring Basis | Not Designated as Hedging Instrument | Embedded derivative liability |  |  |
LIABILITIES: |  |  |
Liabilities at fair value |  |  | $ 0
Level 3 | Nonrecurring Basis | Long-lived assets (2) | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value | [2] | 179 |
Level 3 | Nonrecurring Basis | Goodwill | KAYAK |  |  |
ASSETS: |  |  |
Assets at fair value | [2] | $ 203 |
[1] | Primarily consists of money market fund investments.
[2] | See Note 8 for additional information.

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