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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
Mar. 31, 2012
Mar. 31, 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 42 22