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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Aug. 31, 2013
May 31, 2013
CURRENT ASSETS    
Allowances for receivables $ 84 $ 84
Allowances for spare parts, supplies and fuel $ 209 $ 204
COMMON STOCKHOLDERS' INVESTMENT    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 1,000 1,000
Common stock, shares issued 1,000 1,000
Common Stock, Shares, Outstanding 1,000 1,000