Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Aug. 31, 2011	Aug. 31, 2010	May 31, 2011
Income Taxes [Line Items]
Effective tax rate (percent)	24.30%	26.00%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 220		$ 212
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods	99		93
Increase in liability for payment of interest and penalties	2
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	93
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Years under examination	currently under examination by the Internal Revenue Service (“IRS”) for the 2010 and 2011 tax years.
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	$ 62

Change in Income Tax Penalties and Interest, Accrued

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Income Taxes [Line Items]

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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-Name Accounting Standards Codification
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The tax year(s) being audited in connection with the income tax examination.

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The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ References

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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