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Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring [Table Text Block]



	March 31, 2013													March 31, 2012
(In millions)	Level 1			Level 2			Level 3			Total				Level 1			Level 2			Level 3			Total
Cash Equivalents
Money market funds ⁽¹⁾	$	1,036		$	—		$	—		$	1,036			$	805		$	—		$	—		$	805
Time deposits ⁽²⁾	—			95			—			95				—			132			—			132
Repurchase agreements ⁽²⁾	447			—			—			447				211			—			—			211
Total cash equivalents	$	1,483		$	95		$	—		$	1,578			$	1,016		$	132		$	—		$	1,148

(1) Gross unrealized gain and losses were not material for the years ended March 31, 2013 and 2012. Based on quoted prices of identical investments.

(2) The carrying amounts of these cash equivalents approximated their estimated fair values because of their short maturities.