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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.