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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Nov. 30, 2014
May 31, 2014
CURRENT ASSETS    
Allowances for receivables $ 87fec_AllowancesForReceivables $ 80fec_AllowancesForReceivables
Allowances for spare parts, supplies and fuel $ 214fec_AllowancesForSparePartsSuppliesAndFuel $ 211fec_AllowancesForSparePartsSuppliesAndFuel
COMMON STOCKHOLDERS' INVESTMENT    
Common stock, par value $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 1,000us-gaap_CommonStockSharesAuthorized 1,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 1,000us-gaap_CommonStockSharesIssued 1,000us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 1,000us-gaap_CommonStockSharesOutstanding 1,000us-gaap_CommonStockSharesOutstanding