Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other retirement plans income (expense)	$ 2	$ 3	$ 5	$ 7
Provision for income taxes				(1)
Net income	$ 2	$ 3	$ 5	$ 6