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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($)
$ in Millions
Dec. 31, 2020
May 31, 2020
Dec. 31, 2019
Aug. 31, 2019
Total        
Carrying Value $ 3,759   $ 4,477  
Convertible debt securities | Trip.com Group        
Debt securities        
Cost 525 $ 250   $ 500
Short-term Investments        
Debt securities        
Cost     998  
Gross Unrealized Gains /Upward Adjustments     1  
Gross Unrealized Losses /Downward Adjustments     (1)  
Carrying Value     998  
Short-term Investments | Convertible debt securities | Trip.com Group        
Debt securities        
Cost 500      
Gross Unrealized Gains /Upward Adjustments 1      
Gross Unrealized Losses /Downward Adjustments 0      
Carrying Value 501      
Short-term Investments | International government securities        
Debt securities        
Cost     109  
Gross Unrealized Gains /Upward Adjustments     0  
Gross Unrealized Losses /Downward Adjustments     0  
Carrying Value     109  
Short-term Investments | U.S. government securities        
Debt securities        
Cost     138  
Gross Unrealized Gains /Upward Adjustments     0  
Gross Unrealized Losses /Downward Adjustments     0  
Carrying Value     138  
Short-term Investments | Corporate debt securities        
Debt securities        
Cost     751  
Gross Unrealized Gains /Upward Adjustments     1  
Gross Unrealized Losses /Downward Adjustments     (1)  
Carrying Value     751  
Long-term Investments        
Total        
Cost 1,240   3,810  
Gross Unrealized Gains /Upward Adjustments 2,620   686  
Gross Unrealized Losses /Downward Adjustments (101)   (19)  
Carrying Value 3,759   4,477  
Long-term Investments | Trip.com Group        
Equity securities - other investments        
Cost     655  
Carrying Value     726  
Long-term Investments | Convertible debt securities | Trip.com Group        
Debt securities        
Cost 25   775  
Gross Unrealized Gains /Upward Adjustments 0   0  
Gross Unrealized Losses /Downward Adjustments (1)   (8)  
Carrying Value 24   767  
Long-term Investments | International government securities        
Debt securities        
Cost     68  
Gross Unrealized Gains /Upward Adjustments     0  
Gross Unrealized Losses /Downward Adjustments     0  
Carrying Value     68  
Long-term Investments | U.S. government securities        
Debt securities        
Cost     136  
Gross Unrealized Gains /Upward Adjustments     0  
Gross Unrealized Losses /Downward Adjustments     (1)  
Carrying Value     135  
Long-term Investments | Corporate debt securities        
Debt securities        
Cost     963  
Gross Unrealized Gains /Upward Adjustments     2  
Gross Unrealized Losses /Downward Adjustments     (2)  
Carrying Value     963  
Long-term Investments | Investments in private companies, debt securities        
Debt securities        
Cost 200   250  
Gross Unrealized Gains /Upward Adjustments 0   0  
Gross Unrealized Losses /Downward Adjustments 0   0  
Carrying Value 200   250  
Long-term Investments | Investments in private companies, equity securities        
Equity securities - investments in private companies        
Cost 552   501  
Gross Unrealized Gains /Upward Adjustments 3   0  
Gross Unrealized Losses /Downward Adjustments (100)   0  
Carrying Value 455   501  
Long-term Investments | Equity securities        
Equity securities - other investments        
Cost 463   1,117  
Gross Unrealized Gains /Upward Adjustments 2,617   684  
Gross Unrealized Losses /Downward Adjustments 0   (8)  
Carrying Value $ 3,080   $ 1,793