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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Components of earnings per share
                 
    Three Months
Ended March 31,
 
(Dollars and Shares in Millions, Except Per Share Data)   2012     2011  

Net income attributable to U.S. Bancorp

  $ 1,338     $ 1,046  

Preferred dividends

    (46     (39

Earnings allocated to participating stock awards

    (7     (4
                 

Net income applicable to U.S. Bancorp common shareholders

  $ 1,285     $ 1,003  
                 

Average common shares outstanding

    1,901       1,918  

Net effect of the exercise and assumed purchase of stock awards and conversion of outstanding convertible notes

    9       10  
                 

Average diluted common shares outstanding

    1,910       1,928  
                 

Earnings per common share

  $ .68     $ .52  

Diluted earnings per common share

  $ .67     $ .52