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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2023 | Feb. 28, 2022
Statement of Stockholders' Equity [Abstract] |  |  |  |
Cash dividends declared, per share | $ 1.15 | $ 0.75 | $ 4.60 | $ 3.00
Other comprehensive income, tax benefit | $ (5) | $ (2) | $ 23 | $ 3
Purchase of treasury stock | 1,300,000 | 6,100,000 | 9,200,000 | 8,900,000
Employee incentive plans and other, shares issued | 200,000 | 300,000 | 1,000,000.0 | 1,100,000

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