Available-for-Sale Securities (Tables)

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Securities at Estimated Fair Value

The following table is a summary of our available-for-sale securities (in millions):

	September 30, 2016									December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	$	7,362	$	—	$	—		$	7,362	$	10,161	$	—	$	—		$	10,161
Corporate debt securities	11,152		35		(7		)	11,180		5,795		1		(23		)	5,773
U.S. treasury securities	5,172		6		(2		)	5,176		4,407		—		(18		)	4,389
Residential mortgage and asset-backed securities	3,349		11		(1		)	3,359		1,701		—		(6		)	1,695
U.S. government agencies securities	1,234		1		(1		)	1,234		709		—		(2		)	707
Non-U.S. government securities	609		1		(1		)	609		315		—		(2		)	313
Certificates of deposit	244		—		—			244		448		—		—			448
Municipal debt securities	30		—		—			30		34		—		—			34
Equity securities	357		75		—			432		—		—		—			—
Total	$	29,509	$	129	$	(12	)	$	29,626	$	23,570	$	1	$	(51	)	$	23,520

Summary of the Classification of Available-for-Sale Securities

The following table summarizes the classification of the available-for-sale securities in our Condensed Consolidated Balance Sheets (in millions):

	September 30, 2016		December 31, 2015
Cash and cash equivalents	$	7,392	$	10,163
Short-term marketable securities	2,457		1,756
Long-term marketable securities	19,345		11,601
Other long-term assets	432		—
Total	$	29,626	$	23,520

Summary of Available-for-Sale Securities by Contractual Maturity

The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in millions):

	September 30, 2016
	Amortized Cost		Fair Value
Less than one year	$	9,848	$	9,849
Greater than one year but less than five years	18,620		18,661
Greater than five years but less than ten years	531		531
Greater than ten years	153		153
Total	$	29,152	$	29,194

Summary of Available-for-Sale Securities in a Continuous Loss Position Deemed not to be Other-than-Temporarily Impaired

The following table summarizes our available-for-sale securities that were in a continuous unrealized loss position, but were not deemed to be other-than-temporarily impaired (in millions):

	Less Than 12 Months					12 Months or Greater					Total
	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
September 30, 2016
Corporate debt securities	$	(6	)	$	3,565	$	—		$	166	$	(6	)	$	3,731
U.S. treasury securities	(2		)	1,810		—			—		(2		)	1,810
Residential mortgage and asset-backed securities	(1		)	389		(1		)	35		(2		)	424
U.S. government agencies securities	(1		)	553		—			—		(1		)	553
Non-U.S. government securities	(1		)	299		—			11		(1		)	310
Total	$	(11	)	$	6,616	$	(1	)	$	212	$	(12	)	$	6,828
December 31, 2015
Corporate debt securities	$	(23	)	$	4,891	$	—		$	43	$	(23	)	$	4,934
U.S. treasury securities	(18		)	4,342		—			—		(18		)	4,342
Residential mortgage and asset-backed securities	(6		)	1,626		—			20		(6		)	1,646
U.S. government agencies securities	(2		)	707		—			—		(2		)	707
Non-U.S. government securities	(2		)	313		—			—		(2		)	313
Municipal debt securities	—			21		—			—		—			21
Total	$	(51	)	$	11,900	$	—		$	63	$	(51	)	$	11,963