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