Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
Aug. 31, 2018	Aug. 31, 2017	May 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate on continuing operations (percent)	14.00%	11.40%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 773		$ 698
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	526
Change in income tax penalties and interest accrued	(8)
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	149		$ 157
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	$ 210

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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

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