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Earnings Per Common Share (Schedule Of Potential Common Shares Were Excluded From The Calculation Of Diluted Earnings Per Common Share) (Details) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options and other dilutive securities excluded from the calculation of diluted earnings per common share 44 34 43 81