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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Nov. 30, 2025
May 31, 2025
Statement of Financial Position [Abstract]    
Allowances for receivables $ 900 $ 773
Allowances for spare parts, supplies and fuel $ 317 $ 308
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares issued (in shares) 318,000,000 318,000,000
Treasury stock (in shares) 83,000,000 80,000,000