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INVESTMENTS - Summary of Investments by Major Security Type (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Equity security investments in private companies:    
Cost   $ 501
Short-term investments:    
Carrying Value $ 0 998
Long-term investments:    
Carrying Value 2,946 4,477
Trip.com Group convertible debt securities | Trip.com Group    
Debt securities:    
Cost 525  
Short-term Investments    
Short-term investments:    
Cost   998
Gross Unrealized Gains /Upward Adjustments   1
Gross Unrealized Losses /Downward Adjustments   (1)
Carrying Value   998
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    
Long-term investments:    
Cost 1,737 3,810
Gross Unrealized Gains /Upward Adjustments 1,336 686
Gross Unrealized Losses /Downward Adjustments (127) (19)
Carrying Value 2,946 4,477
Long-term investments | Trip.com Group    
Equity security investments with readily determinable fair value:    
Cost   655
Carrying Value   726
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 | Debt securities    
Debt securities:    
Cost 250 250
Gross Unrealized Gains/Upward Adjustments 0 0
Gross Unrealized Losses/Downward Adjustments 0 0
Carrying Value 250 250
Long-term investments | Investment in private company equity securities    
Equity security investments in private companies:    
Cost 501 501
Gross Unrealized Gains /Upward Adjustments 0 0
Gross Unrealized Losses /Downward Adjustments (100) 0
Carrying Value 401 501
Long-term investments | Trip.com Group convertible debt securities | Trip.com Group    
Debt securities:    
Cost 525 775
Gross Unrealized Gains/Upward Adjustments 0 0
Gross Unrealized Losses/Downward Adjustments (25) (8)
Carrying Value 500 767
Long-term investments | Equity securities    
Equity security investments with readily determinable fair value:    
Cost 461 1,117
Gross Unrealized Gains /Upward Adjustments 1,336 684
Gross Unrealized Losses /Downward Adjustments (2) (8)
Carrying Value $ 1,795 $ 1,793