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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2020
Income Tax Contingency [Line Items]
Federal income tax rate			12.30%	9.80%
Total gross unrecognized tax benefits, excluding related interest and penalties	$ 877		$ 877		$ 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	622		622
Income tax expense	187	$ 34	589	$ 362
Increase (decrease) in liability for payment of interest and penalties	41		41
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit)	199		199		$ 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	50		$ 50
Altera Corp. V. Commissioner
Income Tax Contingency [Line Items]
Unrecognized tax benefits recognized	74
Income tax expense	$ 69

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