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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2020
Income Tax Contingency [Line Items]
Federal income tax rate			12.70%	11.70%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 872		$ 872		$ 771
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	587		587
Income tax expense	205	$ 134	402	$ 328
Increase (decrease) in liability for payment of interest and penalties	33		33
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	191		191		$ 158
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations	60		$ 60
Altera Corp. V. Commissioner
Income Tax Contingency [Line Items]
Unrecognized tax benefits recognized	77
Income tax expense	$ 71

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