Cash, Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2011

Cash, Cash Equivalents and Marketable Securities [Abstract]

Cash, cash equivalents and short and long term marketable securities

			Short-Term		Long-Term
	Cash and		Marketable		Marketable
	Cash Equivalents		Securities		Securities		Total
			(In millions)
September 30, 2011
Cash	$	110	$	—	$	—	$	110
Bank deposits		1,530		—		1		1,531
Money market funds		262		—		—		262
U.S. treasury and and agency obligations		—		143		774		917
Commercial paper		431		336		—		767
Corporate bonds		—		239		395		634
Asset-backed securities and other		—		8		14		22
	$	2,333	$	726	$	1,184	$	4,243
December 31, 2010
Cash	$	103	$	—	$	—	$	103
Bank deposits		455		—		—		455
Money market funds		641		—		—		641
U.S. treasury and and agency obligations		4		586		1,360		1,950
Commercial paper		419		363		—		782
Corporate bonds		—		86		41		127
	$	1,622	$	1,035	$	1,401	$	4,058

Gross unrealized gains and losses and fair values

			Gross		Gross
			Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
			(In millions)
September 30, 2011
U.S. treasury and and agency obligations	$	917	$	1	$	(1	)	$	917
Corporate bonds		636		1		(3	)		634
	$	1,553	$	2	$	(4	)	$	1,551
December 31, 2010
U.S. treasury and and agency obligations	$	1,953	$	2	$	(5	)	$	1,950

Fair value measurements for investments aggregated by major security type

	Level 1		Level 2		Level 3		Fair Value
	(In millions)
September 30, 2011
Cash	$	110	$	—	$	—	$	110
Bank deposits		1,531		—		—		1,531
Money market funds		262		—		—		262
U.S. treasury and and agency obligations		917		—		—		917
Commercial paper		—		767		—		767
Corporate bonds		13		621		—		634
Asset-backed securities and other		—		22		—		22
	$	2,833	$	1,410	$	—	$	4,243
December 31, 2010
Cash	$	103	$	—	$	—	$	103
Bank deposits		455		—		—		455
Money market funds		641		—		—		641
U.S. treasury and and agency obligations		1,950		—		—		1,950
Commercial paper		—		782		—		782
Corporate bonds		20		107		—		127
	$	3,169	$	889	$	—	$	4,058