EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010
Computation of Basic and Diluted Earnings Per Share [Abstract]
Net income	$ 2,192	$ 1,870	$ 4,032	$ 3,223
Weighted average common shares outstanding	5,041	5,044	5,052	5,035
Dilutive effect of employee stock plans	82	73	85	65
Diluted weighted average common shares outstanding	5,123	5,117	5,137	5,100
Basic earnings per share	$ 0.43	$ 0.37	$ 0.80	$ 0.64
Diluted earnings per share	$ 0.43	$ 0.37	$ 0.78	$ 0.63
Shares subject to anti-dilutive stock options and restricted stock-based awards excluded from calculation	117	40	101	100

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Accounting Standards Codification

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+ Details

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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-Name Regulation S-X (SX)

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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