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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments at December 31, 2021 (in millions):
 CostGross
Unrealized
Gains
/Upward Adjustments		Gross
Unrealized
Losses
/Downward Adjustments		Carrying Value
Short-term investments:
Debt securities:
Trip.com Group convertible debt securities $25 $— $— $25 
Long-term investments:
Investments in private companies:
  Equity securities$66 $259 $— $325 
Other long-term investments:
  Equity securities1,165 1,990 (305)2,850 
Total$1,231 $2,249 $(305)$3,175 

The following table summarizes, by major security type, the Company's investments at December 31, 2020 (in millions): 
CostGross
Unrealized
Gains
/Upward Adjustments		Gross
Unrealized
Losses
/Downward Adjustments		Carrying Value
Short-term investments:
Debt securities:
Trip.com Group convertible debt securities$500 $1 $— $501 
Long-term investments:
Investments in private companies:
  Debt securities$200 $— $— $200 
  Equity securities552 3 (100)455 
Other long-term investments:
  Debt securities:
Trip.com Group convertible debt securities 25 — (1)24 
  Equity securities463 2,617 — 3,080 
Total$1,240 $2,620 $(101)$3,759