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Common Stock Repurchase Program (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Common Stock Repurchase Program [Abstract]
Stock Repurchase Program, Authorized Amount	$ 100	$ 200
Stock Repurchased During Period, Shares	4.8
Stock Repurchased During Period, Value	140
cumulative common stock repurchased through repurchase program	9.2
cumulative value of shares repurchased through stock repurchase program	241
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 59

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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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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