Marketable Securities And Cash Equivalents (Tables)

3 Months Ended

Mar. 31, 2013

Marketable Securities And Cash Equivalents [Abstract]

Marketable Securities and Cash Equivalents

			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
			(In millions)
March 31, 2013
United States government obligations
Maturity less than 1 year	$	375	$	-	$	-	$	375
Maturity 1 to 5 years		90		-		-		90
Government-sponsored enterprise obligations
Maturity 1 to 5 years		3		-		-		3
Corporate debt securities
Maturity 1 to 5 years		14		-		-		14
Other debt securities
Maturity less than 1 year		645		-		-		645
Maturity 1 to 5 years		3		-		-		3
Equity securities
Available-for-sale		611		-		(38)		573
	$	1,741	$	-	$	(38)	$	1703
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
			(In millions)
December 31, 2012
United States government obligations
Maturity less than 1 year	$	583	$	-	$	-	$	583
Maturity 1 to 5 years		93				-		93
Government-sponsored enterprise obligations
Maturity 1 to 5 years		2		-		-		2
Corporate debt securities
Maturity 1 to 5 years		15		-		-		15
Other debt securities
Maturity less than 1 year		1,038		-		-		1,038
Maturity 1 to 5 years		3		-		-		3
Equity securities
Available-for-sale		606		3		(5)		604
	$	2,340	$	3	$	(5)	$	2,338