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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Aug. 31, 2015
May. 31, 2015
CURRENT ASSETS    
Allowances for receivables $ 190 $ 185
Allowances for spare parts, supplies and fuel $ 214 $ 207
COMMON STOCKHOLDERS' INVESTMENT    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 800 800
Common stock, shares issued 318 318