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Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Stockholders' Equity (Textual) [Abstract]
Common stock issued as a result of option exercises	744,000
Shares repurchased	0
Remaining capacity for authorized repurchase shares	$ 250

Number of share options (or share units) exercised during the current period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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