Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Aug. 31, 2011	May 31, 2011
CURRENT ASSETS
Allowances for receivables	$ 84	$ 83
Allowances for spare parts, supplies and fuel	$ 174	$ 169
OWNER'S EQUITY
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

A provision for trade and other receivables due within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Also included is a provision for receivables that will not be collected due to the issuance of a credit memo or refund.

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- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of spare parts, supplies and fuel to their net realizable value. This valuation account takes into consideration such factors as excessive quantities based on fleet usage, obsolescence and shrinkage.

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- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
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- Definition

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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-Name Regulation S-X (SX)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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