Fair Value Measurements (Tables)

9 Months Ended

Sep. 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):



	September 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:
U.S. treasury securities	$	3,075	$	—	$	—	$	3,075	$	4,061	$	—	$	—	$	4,061
Certificates of deposit	—		4,392		—		4,392		—		5,131		—		5,131
U.S. government agencies securities	—		932		—		932		—		926		—		926
Non-U.S. government securities	—		260		—		260		—		664		—		664
Corporate debt securities	—		12,757		—		12,757		—		14,747		—		14,747
Residential mortgage and asset-backed securities	—		2,037		—		2,037		—		4,058		—		4,058
Marketable equity securities:
Money market funds	5,138		—		—		5,138		4,714		—		—		4,714
Equity securities	825		—		—		825		635		—		—		635
Deferred compensation plan	139		—		—		139		116		—		—		116
Foreign currency derivative contracts	—		42		—		42		—		13		—		13
Total	$	9,177	$	20,420	$	—	$	29,597	$	9,526	$	25,539	$	—	$	35,065
Liabilities:
Deferred compensation plan	$	139	$	—	$	—	$	139	$	116	$	—	$	—	$	116
Foreign currency derivative contracts	—		6		—		6		—		93		—		93
Total	$	139	$	6	$	—	$	145	$	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):



	September 30, 2018		December 31, 2017
Cash and cash equivalents	$	5,138	$	4,714
Prepaid and other current assets	829		637
Other long-term assets	135		114
Total	$	6,102	$	5,465