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Fair Value Measurements (Tables)
 12 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring [Table Text Block]
Our financial assets measured at fair value on a recurring basis consist of the following:
 
March 31, 2015
 
March 31, 2014
(In millions)
Level 1
Level 2
Level 3
Total
 
Level 1
Level 2
Level 3
Total
Cash Equivalents
 
 
 
 
 
 
 
 
 
Money market funds (1)
$
2,880

$
—

$
—

$
2,880

 
$
2,284

$
—

$
—

$
2,284

Time deposits (2)
—

94

—

94

 
—

12

—

12

Repurchase agreements (2)
1,243

—

—

1,243

 
569

—

—

569

Total cash equivalents
$
4,123

$
94

$
—

$
4,217

 
$
2,853

$
12

$
—

$
2,865