CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Millions, except Per Share data, unless otherwise specified	May 31, 2013	May 31, 2012
Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 296	$ 323
Preferred stock par value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	1.0	1.0
Preferred stock shares outstanding	0	0
Common stock par value per share	$ 0.01	$ 0.01
Common stock shares authorized	11,000	11,000
Common stock shares outstanding	4,646	4,905

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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