FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Aug. 31, 2014	May 31, 2014
Assets [Abstract]
U.S. Treasury securities	$ 476
Commercial paper debt securities	12,164	7,969
Corporate debt securities and other	20,190	16,657
Derivative financial instruments	67	97
Total assets	32,897	24,723
Liabilities [Abstract]
Derivative financial instruments	3
Total debt	32,600	24,200
Marketable security investments maturity information [Abstract]
Maturity of marketable security investments	As of August 31, 2014 and May 31, 2014, approximately 50% and 45%, respectively, of our marketable securities investments mature within one year and 50% and 55%, respectively, mature within one to four years.
Fair Value Measurements Using Input Types Level 1 [Member]
Assets [Abstract]
U.S. Treasury securities	476
Corporate debt securities and other	158	119
Total assets	634	119
Fair Value Measurements Using Input Types Level 2 [Member]
Assets [Abstract]
Commercial paper debt securities	12,164	7,969
Corporate debt securities and other	20,032	16,538
Derivative financial instruments	67	97
Total assets	32,263	24,604
Liabilities [Abstract]
Derivative financial instruments	3
Total debt fair value	$ 35,100	$ 26,400

No authoritative reference available.

No definition available.

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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.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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 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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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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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