Income Taxes - Income before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2015	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Income Tax Contingency [Line Items]
Effective tax rate on continuing operations (percent)		18.70%	23.30%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 479	$ 479		$ 438
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	278	278
Change in income tax penalties and interest accrued		16
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	180	180		$ 164
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	44	$ 44
Tax Year 2011 \| Domestic Tax Authority
Income Tax Contingency [Line Items]
Proposed increase in tax related to the foreign tax credit matter	$ 31

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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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
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Estimated amount of loss resulting from an adverse tax position.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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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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