INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Investments by Major Security Type

The following table summarizes, by major security type, the Company's investments at September 30, 2020 (in millions): 

	Cost		Gross Unrealized Gains /Upward Adjustments		Gross Unrealized Losses /Downward Adjustments		Carrying  Value
Long-term investments:
Investments in private companies:
Debt securities	$	250	$	—	$	—	$	250
Equity securities	501		3		(100)		404
Other long-term investments:
Debt securities:
Trip.com Group convertible debt securities	525		—		(32)		493
Equity securities	461		2,064		—		2,525
Total	$	1,737	$	2,067	$	(132)	$	3,672

The following table summarizes, by major security type, the Company's investments at December 31, 2019 (in millions):

	Cost		Gross Unrealized Gains/Upward Adjustments		Gross Unrealized Losses/Downward Adjustments		Carrying  Value
Short-term investments:
Debt securities:
International government securities	$	109	$	—	$	—	$	109
U.S. government securities	138		—		—		138
Corporate debt securities	751		1		(1)		751
Total	$	998	$	1	$	(1)	$	998
Long-term investments:
Investments in private companies:
Debt securities	$	250	$	—	$	—	$	250
Equity securities	501		—		—		501
Other long-term investments:
Debt securities:
International government securities	68		—		—		68
U.S. government securities	136		—		(1)		135
Corporate debt securities	963		2		(2)		963
Trip.com Group convertible debt securities	775		—		(8)		767
Equity securities	1,117		684		(8)		1,793
Total	$	3,810	$	686	$	(19)	$	4,477