Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security

The amortized cost, gross unrealized gains, gross unrealized losses and fair values of available-for-sale investments by type of security were as follows (in millions):



Types of securities as of December 31, 2018	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair values
U.S. Treasury notes	$	2,710	$	—	$	(47	)	$	2,663
U.S. Treasury bills	8,191		—		—			8,191
Other government-related debt securities:
U.S.	112		—		(2		)	110
Foreign and other	972		1		(41		)	932
Corporate debt securities:
Financial	2,778		—		(81		)	2,697
Industrial	2,603		—		(99		)	2,504
Other	583		—		(21		)	562
Residential-mortgage-backed securities	1,458		—		(36		)	1,422
Other mortgage- and asset-backed securities	483		—		(14		)	469
Money market mutual funds	5,659		—		—			5,659
Other short-term interest-bearing securities	3,515		—		—			3,515
Total available-for-sale investments	$	29,064	$	1	$	(341	)	$	28,724



Types of securities as of December 31, 2017	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair values
U.S. Treasury notes	$	8,313	$	1	$	(72	)	$	8,242
Other government-related debt securities:
U.S.	225		—		(2		)	223
Foreign and other	2,415		18		(11		)	2,422
Corporate debt securities:
Financial	10,089		17		(34		)	10,072
Industrial	9,688		34		(52		)	9,670
Other	1,393		3		(6		)	1,390
Residential-mortgage-backed securities	2,198		—		(30		)	2,168
Other mortgage- and asset-backed securities	2,312		—		(15		)	2,297
Money market mutual funds	3,245		—		—			3,245
Other short-term interest-bearing securities	1,440		—		—			1,440
Total interest-bearing securities	41,318		73		(222		)	41,169
Equity securities	135		14		—			149
Total available-for-sale investments	$	41,453	$	87	$	(222	)	$	41,318

Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets

The fair values of available-for-sale investments by location in the Consolidated Balance Sheets were as follows (in millions):



	December 31,
Consolidated Balance Sheets locations	2018		2017
Cash and cash equivalents	$	6,365	$	3,291
Marketable securities	22,359		37,878
Other assets	—		149
Total available-for-sale investments	$	28,724	$	41,318

Fair values of available-for-sale interest-bearing security investments by contractual maturity

The fair values of available-for-sale interest-bearing security investments by contractual maturity, except for mortgage- and asset-backed securities that do not have a single maturity date, were as follows (in millions):



	December 31,
Contractual maturities	2018		2017
Maturing in one year or less	$	17,424	$	6,733
Maturing after one year through three years	3,356		12,820
Maturing after three years through five years	5,168		13,836
Maturing after five years through ten years	885		3,263
Maturing after ten years	—		52
Mortgage- and asset-backed securities	1,891		4,465
Total interest-bearing securities	$	28,724	$	41,169

Available-for-sale securities, continuous unrealized loss position, fair value

The fair values and gross unrealized losses of available-for-sale investments in an unrealized loss position aggregated by type and length of time that the securities have been in a continuous loss position were as follows (in millions):



	Less than 12 months					12 months or more
Types of securities as of December 31, 2018	Fair values		Unrealized losses			Fair values		Unrealized losses
U.S. Treasury notes	$	1,219	$	(21	)	$	1,444	$	(26	)
Other government-related debt securities:
U.S.	—		—			110		(2		)
Foreign and other	631		(31		)	240		(10		)
Corporate debt securities:
Financial	1,968		(59		)	718		(22		)
Industrial	1,898		(81		)	529		(18		)
Other	529		(20		)	28		(1		)
Residential-mortgage-backed securities	576		(14		)	840		(22		)
Other mortgage- and asset-backed securities	17		—			451		(14		)
Total	$	6,838	$	(226	)	$	4,360	$	(115	)



	Less than 12 months					12 months or more
Types of securities as of December 31, 2017	Fair values		Unrealized losses			Fair values		Unrealized losses
U.S. Treasury notes	$	7,728	$	(70	)	$	195	$	(2	)
Other government-related debt securities:
U.S.	188		(1		)	34		(1		)
Foreign and other	1,163		(9		)	115		(2		)
Corporate debt securities:
Financial	5,928		(28		)	462		(6		)
Industrial	5,760		(43		)	612		(9		)
Other	868		(4		)	117		(2		)
Residential-mortgage-backed securities	1,838		(24		)	276		(6		)
Other mortgage- and asset-backed securities	1,777		(12		)	250		(3		)
Total	$	25,250	$	(191	)	$	2,061	$	(31	)