Financial Instruments

Cash, Cash Equivalents and Marketable Securities

The following tables summarize our cash and available-for-sale securities by significant investment category.



	March 29, 2013
(In thousands)	Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities

Cash	$	61,541	$	—	$	—		$	61,541	$	61,541	$	—	$	—

Available for sale:
Level 1:
Money market funds	2,875,699		—		—			2,875,699		2,875,699		—		—
U.S. treasury securities	568,071		5,130		—			573,201		16,347		41,554		515,300
Subtotal	3,443,770		5,130		—			3,448,900		2,892,046		41,554		515,300

Level 2:
U.S. agency securities	106,068		50		(3		)	106,115		—		55,524		50,591
Non-U.S. government securities	16,611		5		(5		)	16,611		—		3,222		13,389
Municipal bond	612		1		—			613		—		613		—
Corporate securities	202,753		489		(52		)	203,190		—		70,430		132,760
Subtotal	326,044		545		(60		)	326,529		—		129,789		196,740
Total	$	3,831,355	$	5,675	$	(60	)	$	3,836,970	$	2,953,587	$	171,343	$	712,040



	December 31, 2012
(In thousands)	Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities

Cash	$	89,194	$	—	$	—		$	89,194	$	89,194	$	—	$	—

Available for sale:
Level 1:
Money market funds	2,739,904		—		—			2,739,904		2,739,904		—		—
U.S. treasury securities	564,713		5,231		(3		)	569,941		33,519		22,493		513,929
Subtotal	3,304,617		5,231		(3		)	3,309,845		2,773,423		22,493		513,929

Level 2:
U.S. agency securities	116,802		58		(1		)	116,859		11,799		53,438		51,622
Non-U.S. government securities	11,644		10		(2		)	11,652		—		2,730		8,922
Municipal bond	1,372		1		—			1,373		—		752		621
Corporate securities	193,048		436		(64		)	193,420		2,211		61,545		129,664
Subtotal	322,866		505		(67		)	323,304		14,010		118,465		190,829
Total	$	3,716,677	$	5,736	$	(70	)	$	3,722,343	$	2,876,627	$	140,958	$	704,758

We have certain cost method investments of approximately $4.7 million. These investments are included within Other assets, net in our consolidated balance sheets.

The adjusted cost and estimated fair value of marketable debt securities (corporate securities, municipal bonds, U.S. and foreign government securities, and U.S. treasury securities) as of March 29, 2013, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.



	March 29, 2013
(In thousands)	Cost		Estimated Fair Value
Due in one year or less	$	187,633	$	187,690
Due after one year through five years	706,482		712,040
	$	894,115	$	899,730