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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stockholders Equity (Textual) [Abstract]
Share repurchase authorization	$ 250
Shares repurchased	0	0
Remaining capacity for authorized repurchase shares	$ 250

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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