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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Statement Of Stockholders Equity [Abstract] |  |  |  |
Cash dividends declared, per share | $ 0.65 | $ 0.65 | $ 2.60 | $ 2.60
Other comprehensive income, tax (expense)/benefit | $ 13 | $ (2) | $ 22 | $ 43
Purchase of treasury stock | 0.0 | 600,000 | 20,000.00 | 6,000,000.0
Employee incentive plans and other, shares issued | 100,000 | 100,000 | 600,000 | 600,000

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