Cash, Cash Equivalents, and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Fair Value by Major Security Type

The following tables summarize, by major security type, our cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in millions):

	September 30, 2016										December 31, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Total Estimated Fair Value			Total Estimated Fair Value
Cash	$	5,730	$	—	$	—		$	5,730		$	6,201
Level 1 securities:
Money market funds	8,386		—		—			8,386			8,025
Equity securities	23		106		—			129			15
Level 2 securities:
Foreign government and agency securities	45		1		—			46			49
U.S. government and agency securities	3,695		3		(4		)	3,694			5,167
Corporate debt securities	587		2		—			589			477
Asset-backed securities	152		—		(1		)	151			117
Other fixed income securities	90		—		—			90			42
	$	18,708	$	112	$	(5	)	$	18,815		$	20,093
Less: Restricted cash, cash equivalents, and marketable securities (1)								(468		)	(285		)
Total cash, cash equivalents, and marketable securities								$	18,347		$	19,808

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(1) We are required to pledge or otherwise restrict a portion of our cash, cash equivalents, and marketable securities as collateral for standby and trade letters of credit, guarantees, debt, real estate leases, and amounts due to third-party sellers in certain jurisdictions. We classify cash, cash equivalents, and marketable securities with use restrictions of less than twelve months as “Accounts receivable, net and other” and of twelve months or longer as non-current “Other assets” on our consolidated balance sheets. See “Note 3 — Commitments and Contingencies.”

Investments Classified by Contractual Maturity Date

The following table summarizes the contractual maturities of our cash equivalents and marketable fixed-income securities as of September 30, 2016 (in millions):

	Amortized Cost		Estimated Fair Value
Due within one year	$	10,647	$	10,648
Due after one year through five years	1,933		1,934
Due after five years through ten years	193		193
Due after ten years	182		181
Total	$	12,955	$	12,956