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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Feb. 28, 2014
May 31, 2013
CURRENT ASSETS    
Allowances for receivables $ 155 $ 176
Allowances for spare parts, supplies and fuel $ 207 $ 205
COMMON STOCKHOLDERS' INVESTMENT    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 800 800
Common stock, shares issued 318 318