Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2019
Income Taxes [Line Items]
Effective tax rate	15.00%		25.00%	17.20%	18.50%
Income tax repatriation of foreign earnings and voluntary contributions to domestic pension plans	$ 108
Income tax expense (benefit)	$ 157		$ 105	$ 698	$ 368
Benefit from reduction of valuation allowance					$ 133
Recognition of cumulative benefit from TCJA						$ 233
IRS [Member]
Income Taxes [Line Items]
Income tax expense (benefit)		$ (130)		$ (191)