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Shareholders' Equity (Schedule of Share Repurchase Plan Authorization) (Details) (USD $)
In Millions
1 Months Ended9 Months Ended
Apr. 30, 2011
Oct. 31, 2008
Feb. 29, 2008
Sep. 30, 2011
Stockholders' Equity Note [Abstract]    
Share Repurchase Plan, Authorized Repurchase Amount$ 129$ 100$ 400$ 629