FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions	Aug. 31, 2011	May 31, 2011
Fair value of debt (Narrative) [Abstract]
Total debt	$ 14,800	$ 15,900
Total debt fair value	16,900	17,400
Fair Value Measurements Using Input Types Level 1 [Member]
Assets (Fair Value) [Abstract]
Money market funds	65	3,362
U.S. Treasury, U.S. government and U.S. government agency debt securities	1,415	1,150
Corporate debt securities and other	101	106
Total assets	1,581	4,618
Fair Value Measurements Using Input Types Level 2 [Member]
Assets (Fair Value) [Abstract]
Commercial paper debt securities	16,863	11,884
Corporate debt securities and other	1,879	1,885
Derivative financial instruments	86	69
Total assets	18,828	13,838
Fair Value Measurements Using Input Types Level 3 [Member]
Liabilities (Fair Value) [Abstract]
Contingent consideration	353
Total liabilities	353
Total fair value [Member]
Assets (Fair Value) [Abstract]
Money market funds	65	3,362
U.S. Treasury, U.S. government and U.S. government agency debt securities	1,415	1,150
Commercial paper debt securities	16,863	11,884
Corporate debt securities and other	1,980	1,991
Derivative financial instruments	86	69
Total assets	20,409	18,456
Liabilities (Fair Value) [Abstract]
Contingent consideration	353
Total liabilities	$ 353

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Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
-Name Accounting Standards Codification
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The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments. Their value is derived from the values of one or more underlying assets, reference rates, or indices of asset values. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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