CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Millions, except Per Share data, unless otherwise specified	Aug. 31, 2012	May 31, 2012
Condensed Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 318	$ 323
Preferred stock par or stated value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	1	1
Preferred stock shares outstanding	0	0
Common stock par or stated value per share	$ 0.01	$ 0.01
Common stock shares authorized	11,000	11,000
Common stock shares outstanding	4,831	4,905