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Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring [Table Text Block]



	March 31, 2014													March 31, 2013
(In millions)	Level 1			Level 2			Level 3			Total				Level 1			Level 2			Level 3			Total
Cash Equivalents
Money market funds ⁽¹⁾	$	2,284		$	—		$	—		$	2,284			$	1,036		$	—		$	—		$	1,036
Time deposits ⁽²⁾	—			12			—			12				—			95			—			95
Repurchase agreements ⁽²⁾	569			—			—			569				447			—			—			447
Total cash equivalents	$	2,853		$	12		$	—		$	2,865			$	1,483		$	95		$	—		$	1,578

(1) Gross unrealized gain and losses were not material for the years ended March 31, 2014 and 2013. 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.