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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Components of earnings per share
                                 
    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
(Dollars and Shares in Millions, Except Per Share Data)   2012     2011     2012     2011  

Net income attributable to U.S. Bancorp

  $ 1,415     $ 1,203     $ 2,753     $ 2,249  

Preferred dividends

    (64     (30     (110     (69

Earnings allocated to participating stock awards

    (6     (6     (13     (10
                                 

Net income applicable to U.S. Bancorp common shareholders

  $ 1,345     $ 1,167     $ 2,630     $ 2,170  
                                 

Average common shares outstanding

    1,888       1,921       1,895       1,920  

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

    10       8       9       9  
                                 

Average diluted common shares outstanding

    1,898       1,929       1,904       1,929  
                                 

Earnings per common share

  $ .71     $ .61     $ 1.39     $ 1.13  

Diluted earnings per common share

  $ .71     $ .60     $ 1.38     $ 1.12