CONSOLIDATED BALANCE SHEETS PARENTHETICAL - USD ($) shares in Millions, $ in Millions	May. 31, 2015	May. 31, 2014
Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 285	$ 306
Preferred stock par value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	1.0	1.0
Preferred stock shares outstanding	0.0	0.0
Common stock par value per share	$ 0.01	$ 0.01
Common stock shares authorized	11,000.0	11,000.0
Common stock shares outstanding	4,343.0	4,464.0