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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Feb. 28, 2019
May 31, 2018
CURRENT ASSETS    
Allowances for receivables $ 318 $ 401
Allowances for spare parts, supplies and fuel $ 339 $ 268
COMMON STOCKHOLDERS' INVESTMENT    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 800,000,000 800,000,000
Common stock, shares issued 318,000,000 318,000,000