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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared, per share $ 1.26 $ 1.15 $ 2.52 $ 3.45
Other comprehensive loss, tax benefit $ (14) $ 10 $ (10) $ 28
Purchase of treasury stock 2.0 7.9 3.9 7.9
Employee incentive plans and other, shares issued 0.4 0.1 1.5 0.8