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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
May 31, 2025
May 31, 2024
Statement of Financial Position [Abstract]    
Allowances for receivables $ 773 $ 775
Allowances for spare parts, supplies and fuel $ 308 $ 288
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) 80,000,000 72,000,000