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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Statement Of Stockholders Equity [Abstract]        
Cash dividends declared, per share $ 0.75 $ 0.65 $ 2.25 $ 1.95
Other comprehensive income, tax benefit/(expense) $ 5 $ (6) $ 5 $ (3)
Purchase of treasury stock 900,000 0.0 2,800,000 0.0
Employee incentive plans and other, shares issued 200,000 2,400,000 800,000 3,400,000