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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investment [Table Text Block]
The following table summarizes, by major security type, the Company's investments at June 30, 2020 (in millions): 
 CostGross
Unrealized Gains /Upward Adjustments		Gross
Unrealized Losses /Downward Adjustments
Carrying
 Value
Long-term investments:
Investments in private companies:
  Debt securities$250  $—  $—  $250  
  Equity securities501  —  (100) 401  
Other long-term investments:
  Debt securities:
Trip.com Group convertible debt securities 525  —  (25) 500  
  Equity securities461  1,336  (2) 1,795  
Total$1,737  $1,336  $(127) $2,946  
The following table summarizes, by major security type, the Company's investments at December 31, 2019 (in millions):
 CostGross
Unrealized Gains/Upward Adjustments
Gross
Unrealized Losses/Downward Adjustments
Carrying
 Value
Short-term investments:
Debt securities:
International government securities$109  $—  $—  $109  
U.S. government securities138  —  —  138  
Corporate debt securities751  1  (1) 751  
Total$998  $1  $(1) $998  
Long-term investments:
Investments in private companies:
  Debt securities$250  $—  $—  $250  
  Equity securities501  —  —  501  
Other long-term investments:
  Debt securities:
International government securities68  —  —  68  
U.S. government securities136  —  (1) 135  
Corporate debt securities963  2  (2) 963  
Trip.com Group convertible debt securities 775  —  (8) 767  
  Equity securities1,117  684  (8) 1,793  
Total $3,810  $686  $(19) $4,477