Income Taxes (Detail) - USD ($) $ in Millions	6 Months Ended
Nov. 30, 2017	Nov. 30, 2016	May 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate on continuing operations (percent)	12.00%	12.70%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 514		$ 461
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	256
Change in income tax penalties and interest accrued	14
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	157		$ 171
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	$ 51

Change in Income Tax Penalties and Interest, Accrued

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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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 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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