Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other retirement plans (expense) income	$ 10	$ 10	$ 107
Provision for income taxes	(2)	(3)	(25)
Net income	$ 8	$ 7	$ 82