Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data	May 31, 2011	May 31, 2010
CURRENT ASSETS
Allowances for receivables	$ 182	$ 166
Allowances for spare parts, supplies and fuel	$ 169	$ 170
COMMON STOCKHOLDERS' INVESTMENT
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	800	800
Common stock, shares issued	317	314

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.

+ Details

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Period Type:	instant

- Details

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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 FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

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- Definition

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

+ 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

+ Details

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- Definition

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.

+ 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

+ Details

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- Details

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