INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Investment [Table Text Block]

The following table summarizes, by major security type, the Company's investments at March 31, 2020 (in millions): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Carrying  Value
Short-term investments:
Debt securities:
Corporate debt securities	$	164	$	—	$	—		$	164
Trip.com Group convertible debt securities	250		—		(2		)	248
Equity securities:
Trip.com Group equity securities	531		—		(117		)	414
Total	$	945	$	—	$	(119	)	$	826
Long-term investments:
Investments in private companies:
Debt securities	$	250	$	—	$	(20	)	$	230
Equity securities	501		—		(100		)	401
Other long-term investments:
Debt securities:
Trip.com Group convertible debt securities	525		—		(77		)	448
Equity securities	461		522		(6		)	977
Total	$	1,737	$	522	$	(203	)	$	2,056

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

	Cost		Gross  Unrealized  Gains		Gross  Unrealized  Losses			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