Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Feb. 29, 2012	May 31, 2011
Assets
Derivative assets	$ 157	$ 53
Fair Value, Measurements, Recurring
Assets
Derivative assets	157	53
Available-for-sale securities	2,304	3,645
Total Assets	2,461	3,698
Liabilities
Total Liabilities	75	197
Fair Value, Measurements, Recurring \| U.S. Treasury securities \| Cash and equivalents
Assets
Available-for-sale securities	79	125
Fair Value, Measurements, Recurring \| U.S. Treasury securities \| Short-term investments
Assets
Available-for-sale securities	705	1,473
Fair Value, Measurements, Recurring \| Commercial paper and bonds \| Cash and equivalents
Assets
Available-for-sale securities	150	157
Fair Value, Measurements, Recurring \| Commercial paper and bonds \| Short-term investments
Assets
Available-for-sale securities	194	802
Fair Value, Measurements, Recurring \| Money market funds \| Cash and equivalents
Assets
Available-for-sale securities	801	780
Fair Value, Measurements, Recurring \| U.S. Agency securities \| Cash and equivalents
Assets
Available-for-sale securities	95
Fair Value, Measurements, Recurring \| U.S. Agency securities \| Short-term investments
Assets
Available-for-sale securities	277	308
Fair Value, Measurements, Recurring \| Non-marketable preferred stock \| Other long-term assets
Assets
Available-for-sale securities	3
Fair Value, Measurements, Recurring \| Foreign exchange forwards and options \| Other Assets
Assets
Derivative assets	141	38
Fair Value, Measurements, Recurring \| Foreign exchange forwards and options \| Other Liabilities
Liabilities
Derivative liabilities	75	197
Fair Value, Measurements, Recurring \| Interest rate swap contracts \| Other Assets
Assets
Derivative assets	16	15
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Derivative assets	0	0
Available-for-sale securities	784	1,598
Total Assets	784	1,598
Liabilities
Total Liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| U.S. Treasury securities \| Cash and equivalents
Assets
Available-for-sale securities	79	125
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| U.S. Treasury securities \| Short-term investments
Assets
Available-for-sale securities	705	1,473
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Commercial paper and bonds \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Commercial paper and bonds \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Money market funds \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| U.S. Agency securities \| Cash and equivalents
Assets
Available-for-sale securities	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| U.S. Agency securities \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Non-marketable preferred stock \| Other long-term assets
Assets
Available-for-sale securities	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Foreign exchange forwards and options \| Other Assets
Assets
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Foreign exchange forwards and options \| Other Liabilities
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Interest rate swap contracts \| Other Assets
Assets
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Derivative assets	157	53
Available-for-sale securities	1,517	2,047
Total Assets	1,674	2,100
Liabilities
Total Liabilities	75	197
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| U.S. Treasury securities \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| U.S. Treasury securities \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Commercial paper and bonds \| Cash and equivalents
Assets
Available-for-sale securities	150	157
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Commercial paper and bonds \| Short-term investments
Assets
Available-for-sale securities	194	802
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Money market funds \| Cash and equivalents
Assets
Available-for-sale securities	801	780
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| U.S. Agency securities \| Cash and equivalents
Assets
Available-for-sale securities	95
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| U.S. Agency securities \| Short-term investments
Assets
Available-for-sale securities	277	308
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Non-marketable preferred stock \| Other long-term assets
Assets
Available-for-sale securities	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Foreign exchange forwards and options \| Other Assets
Assets
Derivative assets	141	38
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Foreign exchange forwards and options \| Other Liabilities
Liabilities
Derivative liabilities	75	197
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Interest rate swap contracts \| Other Assets
Assets
Derivative assets	16	15
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3
Assets
Derivative assets	0	0
Available-for-sale securities	3	0
Total Assets	3	0
Liabilities
Total Liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| U.S. Treasury securities \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| U.S. Treasury securities \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Commercial paper and bonds \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Commercial paper and bonds \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Money market funds \| Cash and equivalents
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| U.S. Agency securities \| Cash and equivalents
Assets
Available-for-sale securities	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| U.S. Agency securities \| Short-term investments
Assets
Available-for-sale securities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Non-marketable preferred stock \| Other long-term assets
Assets
Available-for-sale securities	3
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Foreign exchange forwards and options \| Other Assets
Assets
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Foreign exchange forwards and options \| Other Liabilities
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Interest rate swap contracts \| Other Assets
Assets
Derivative assets	$ 0	$ 0

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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

+ References+ Details