Income Taxes (Detail) - USD ($) $ in Millions	6 Months Ended
Nov. 30, 2016	Nov. 30, 2015	May 31, 2016
Income Tax Contingency [Line Items]
Effective tax rate on continuing operations (percent)	12.70%	18.70%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 397		$ 506
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	174
Change in income tax penalties and interest accrued	11
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	220		$ 209
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	170
Tax Year 2011 \| Domestic Tax Authority
Income Tax Contingency [Line Items]
Proposed increase in tax related to the foreign tax credit matter	$ 254

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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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.

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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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