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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
3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other retirement plans income $ 2 $ 26 $ 5 $ 53
Provision for income taxes   (6) (1) (12)
Net income $ 2 $ 20 $ 4 $ 41