CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Millions, except Per Share data, unless otherwise specified	Nov. 30, 2014	May 31, 2014
Condensed Consolidated Balance Sheets
Allowance for doubtful accounts receivable	$ 272	$ 306
Preferred stock par value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	1.0us-gaap_PreferredStockSharesAuthorized	1.0us-gaap_PreferredStockSharesAuthorized
Preferred stock shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock par value per share	$ 0.01	$ 0.01
Common stock shares authorized	11,000us-gaap_CommonStockSharesAuthorized	11,000us-gaap_CommonStockSharesAuthorized
Common stock shares outstanding	4,398us-gaap_CommonStockSharesOutstanding	4,464us-gaap_CommonStockSharesOutstanding

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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