Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Summary of assets and liabilities measured at fair value

The following table summarizes the types of assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in millions):



	June 30, 2018								December 31, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Available-for-sale debt securities:
Corporate debt securities	$	—	$	12,092	$	—	$	12,092	$	—	$	14,747	$	—	$	14,747
U.S. treasury securities	3,391		—		—		3,391		4,061		—		—		4,061
Residential mortgage and asset-backed securities	—		2,657		—		2,657		—		4,058		—		4,058
U.S. government agencies securities	—		872		—		872		—		926		—		926
Certificates of deposit	—		3,145		—		3,145		—		5,131		—		5,131
Non-U.S. government securities	—		404		—		404		—		664		—		664
Marketable equity securities:
Money market funds	7,060		—		—		7,060		4,714		—		—		4,714
Equity securities	663		—		—		663		635		—		—		635
Deferred compensation plan	131		—		—		131		116		—		—		116
Foreign currency derivative contracts	—		53		—		53		—		13		—		13
Total	$	11,245	$	19,223	$	—	$	30,468	$	9,526	$	25,539	$	—	$	35,065
Liabilities:
Deferred compensation plan	$	131	$	—	$	—	$	131	$	116	$	—	$	—	$	116
Foreign currency derivative contracts	—		11		—		11		—		93		—		93
Total	$	131	$	11	$	—	$	142	$	116	$	93	$	—	$	209

Summary of the Classification of Marketable Equity Securities

The following table summarizes the classification of our marketable equity securities in our Condensed Consolidated Balance Sheets (in millions):



	June 30, 2018		December 31, 2017
Cash and cash equivalents	$	7,060	$	4,714
Prepaid and other current assets	666		637
Other long-term assets	128		114
Total	$	7,854	$	5,465