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Antidilutive Shares (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive Stock Options Excluded Exercise Price Greater Than Average Market Price 7.1 [1] 12.6 [1] 7.1 [1] 9.1 [1]
Preferred Stock Outstanding [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 16.9 0 16.9 16.5
[1] These options are outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.