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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)
 12 Months Ended
May 31, 2016
Cash, Cash Equivalents and Marketable Securities [Abstract]  
Cash, Cash Equivalents and Marketable Securities

 

 

May 31,

(in millions)

 

2016

 

2015

Money market funds

 

$

3,750

 

$

—

U.S. Treasury securities

 

 

214

 

 

668

Commercial paper debt securities

 

 

  2,155

 

 

  9,203

Corporate debt securities and other

 

 

35,274

 

 

28,844

Total investments

 

$

41,393

 

$

38,715

Investments classified as cash equivalents

 

$

 5,420

 

$

  6,063

Investments classified as marketable securities

 

$

35,973

 

$

32,652