Cash, Cash Equivalents, and Marketable Securities (Tables)

12 Months Ended

Jun. 30, 2012

Fair Value, by Balance Sheet Grouping

The following table summarizes, 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):

	June 30, 2012										December 31, 2011
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Total Estimated Fair Value			Total Estimated Fair Value
Cash	$	1,252	$	—	$	—		$	1,252		$	1,207
Level 1 securities:
Money market funds		1,164		—		—			1,164			3,651
Equity securities		2		—		(1	)		1			1
Level 2 securities:
Foreign government and agency securities		992		13		(1	)		1,004			1,640
U.S. government and agency securities		961		3		(1	)		963			2,593
Corporate debt securities		667		5		(1	)		671			563
Asset-backed securities		59		—		—			59			55
Other fixed income securities		21		—		—			21			22
	$	5,118	$	21	$	(4	)	$	5,135		$	9,732
Less: Restricted cash, cash equivalents, and marketable securities (1)									(165	)		(156	)
Total cash, cash equivalents, and marketable securities								$	4,970		$	9,576

(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 and real estate lease agreements. We classify cash 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.”