Income Taxes (Detail) - USD ($)	9 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Dec. 31, 2019	May 31, 2019
Income Tax Disclosure [Abstract]
Federal income tax rate	9.80%	14.60%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 802,000,000			$ 808,000,000
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	555,000,000
Increase (decrease) in liability for payment of interest and penalties	(20,000,000)
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	154,000,000			$ 174,000,000
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	40,000,000
Undistributed earnings of foreign subsidiaries			$ 8,700,000,000
Deferred tax liabilities, undistributed foreign earnings	$ 1,300,000,000		$ 0

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

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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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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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 undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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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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