Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Per Share data	Dec. 31, 2010	Dec. 31, 2009
Current assets:
Allowance for Doubtful Accounts Receivable, Current	$ 15	$ 22
Stockholders' equity:
Common Stock, Shares Authorized	960	960
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Issued	620	618
Treasury Stock, Shares	35	35

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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