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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
May 31, 2020
Aug. 31, 2019
Total        
Carrying Value $ 3,175 $ 3,759    
Convertible debt securities | Trip.com Group        
Debt securities        
Cost 500 525 $ 250 $ 500
Short-term Investments | Convertible debt securities | Trip.com Group        
Debt securities        
Cost 25 500    
Gross Unrealized Gains /Upward Adjustments 0 1    
Gross Unrealized Losses /Downward Adjustments 0 0    
Carrying Value 25 501    
Long-term Investments        
Total        
Cost 1,231 1,240    
Gross Unrealized Gains /Upward Adjustments 2,249 2,620    
Gross Unrealized Losses /Downward Adjustments (305) (101)    
Carrying Value 3,175 3,759    
Long-term Investments | Trip.com Group        
Equity securities - other investments        
Cost   655    
Long-term Investments | Convertible debt securities | Trip.com Group        
Debt securities        
Cost   25    
Gross Unrealized Gains /Upward Adjustments   0    
Gross Unrealized Losses /Downward Adjustments   (1)    
Carrying Value   24    
Long-term Investments | Investments in private companies, debt securities        
Debt securities        
Cost   200    
Gross Unrealized Gains /Upward Adjustments   0    
Gross Unrealized Losses /Downward Adjustments   0    
Carrying Value   200    
Long-term Investments | Investments in private companies, equity securities        
Equity securities - investments in private companies        
Cost 66 552    
Gross Unrealized Gains /Upward Adjustments 259 3    
Gross Unrealized Losses /Downward Adjustments 0 (100)    
Carrying Value 325 455    
Long-term Investments | Equity securities        
Equity securities - other investments        
Cost 1,165 463    
Gross Unrealized Gains /Upward Adjustments 1,990 2,617    
Gross Unrealized Losses /Downward Adjustments (305) 0    
Carrying Value $ 2,850 $ 3,080