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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 6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other retirement plans income (expense) $ 2 $ 2 $ 3 $ 4
Provision for income taxes   (1)   (1)
Net income $ 2 $ 1 $ 3 $ 3