Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of financial assets measured at fair value on a recurring basis

Our financial assets measured at fair value on a recurring basis consist of the following:

	March 31, 2016								March 31, 2015
(In millions)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash Equivalents
Money market funds (1)	$	2,413	$	—	$	—	$	2,413	$	2,880	$	—	$	—	$	2,880
Time deposits (2)	—		—		—		—		—		94		—		94
Repurchase agreements (2)	—		—		—		—		1,243		—		—		1,243
Total cash equivalents	$	2,413	$	—	$	—	$	2,413	$	4,123	$	94	$	—	$	4,217

(1) Gross unrealized gain and losses were not material for the years ended March 31, 2016 and 2015 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.