Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts receivable	$ 46	$ 45
Allowance for doubtful notes receivable securitized vacation ownership	$ 10	$ 10
Common stock par value	$ 0.01	$ 0.01
Common Stock, authorized	1,000,000,000	1,000,000,000
Common Stock, outstanding	195,913,400	192,970,437

A valuation allowance for securitized vacation ownership notes receivable

No definition available.

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- Definition

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.

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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.

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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 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.

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