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Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared, per share $ 1.38 $ 1.26 $ 5.52 $ 3.78
Other comprehensive (loss)/income, net of tax benefit/(expense) $ 3 $ 2 $ 2 $ (8)
Purchases of common stock 1.8 4.1 8.9 8.0
Employee incentive plans and other, shares issued 0.2 0.3 2.6 1.8