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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)
 12 Months Ended
May. 31, 2015
Cash, Cash Equivalents and Marketable Securities [Abstract]  
Cash, Cash Equivalents and Marketable Securities

 

 

May 31,

(in millions)

 

2015

 

2014

U.S. Treasury securities

 

$

668

 

$

—

Commercial paper debt securities

 

 

  9,203

 

 

  7,969

Corporate debt securities and other

 

 

28,844

 

 

16,657

Total investments

 

$

38,715

 

$

24,626

Investments classified as cash equivalents

 

$

 6,063

 

$

  3,576

Investments classified as marketable securities

 

$

32,652

 

$

21,050