Marketable Securities

9 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

MARKETABLE SECURITIES

NOTE E – MARKETABLE SECURITIES

At December 31, 2011, available-for-sale securities consisted of the following:

	December 31, 2011 (in millions)
	Aggregate Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. Treasury and agency securities	$	55	$	—	$	—	$	55
Municipal securities		2		—		—		2
Corporate debt securities		124		—		—		124
	$	181	$	—	$	—	$	181

At December 31, 2011, the Company did not have any debt securities that were in a continuous unrealized loss position for greater than 12 months. Proceeds from the sale of marketable securities and realized gains and realized losses for the nine months ended December 31, 2011 were approximately $27 million and less than $1 million, respectively. At December 31, 2011, $102 million of marketable securities had scheduled maturities of less than one year, and approximately $79 million had maturities of greater than one year but not exceeding three years.

At March 31, 2011, available-for-sale securities consisted of the following:

	March 31, 2011 (in millions)
	Aggregate Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses		Aggregate Fair Value
U.S. Treasury and agency securities	$	60	$	—	$	—	$	60
Municipal securities		2		—		—		2
Corporate debt securities		117		—		—		117
	$	179	$	—	$	—	$	179

At March 31, 2011, the Company did not have any debt securities that were in a continuous unrealized loss position for greater than 12 months. At March 31, 2011, $75 million of marketable securities had scheduled maturities of less than one year, and approximately $104 million had scheduled maturities of greater than one year but not exceeding three years.