INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Investment [Table Text Block]

The following table summarizes, by major security type, the Company's investments in marketable securities at September 30, 2019 (in millions): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair  Value
Short-term investments in marketable securities:
Debt securities:
International government securities	$	108	$	—	$	—		$	108
U.S. government securities	154		—		(1		)	153
Corporate debt securities	704		—		(1		)	703
Time deposits and certificates of deposit	9		—		—			9
Total	$	975	$	—	$	(2	)	$	973
Long-term investments in marketable securities:
Debt securities:
International government securities	$	28	$	—	$	—		$	28
U.S. government securities	178		—		—			178
Corporate debt securities	1,166		3		(3		)	1,166
Trip.com Group convertible debt securities	775		—		(34		)	741
Marketable equity securities	1,105		389		(39		)	1,455
Total	$	3,252	$	392	$	(76	)	$	3,568

The following table summarizes, by major security type, the Company's investments in marketable securities at December 31, 2018 (in millions):

	Cost		Gross  Unrealized  Gains		Gross  Unrealized  Losses			Fair  Value
Short-term investments in marketable securities:
Debt securities:
International government securities	$	314	$	—	$	—		$	314
U.S. government securities	658		—		(2		)	656
Corporate debt securities	2,693		—		(12		)	2,681
U.S. government agency securities	1		—		—			1
Commercial paper	7		—		—			7
Time deposits and certificates of deposit	1		—		—			1
Total	$	3,674	$	—	$	(14	)	$	3,660
Long-term investments in marketable securities:
Debt securities:
International government securities	$	797	$	3	$	—		$	800
U.S. government securities	299		—		(6		)	293
Corporate debt securities	4,445		4		(48		)	4,401
Trip.com Group convertible debt securities	1,275		—		(98		)	1,177
Marketable equity securities	1,105		3		(72		)	1,036
Total	$	7,921	$	10	$	(224	)	$	7,707