CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Millions, except Per Share data, unless otherwise specified	May 31, 2012	May 31, 2011
Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 323	$ 372
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	4,905	5,068