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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Stock Option [Member]
Sep. 30, 2010
Stock Option [Member]
Sep. 30, 2011
Stock Option [Member]
Sep. 30, 2010
Stock Option [Member]
Jun. 10, 2010
Series A
Components of earnings per share         
Net income attributable to U.S. Bancorp$ 1,273$ 908$ 3,522$ 2,343     
Preferred stock dividends(30)(33)(99)(70)     
Equity portion of gain on ITS exchange transaction, net of tax.   118     
Earnings allocated to participating stock awards(6)(4)(16)(10)     
Net income applicable to U.S. Bancorp common shareholders$ 1,237$ 871$ 3,407$ 2,381     
Average common shares outstanding1,915,000,0001,913,000,0001,918,000,0001,911,000,000     
Net effect of the exercise and assumed purchase of stock awards and conversion of outstanding convertible notes7,000,0007,000,0008,000,0009,000,000     
Average diluted common shares outstanding1,922,000,0001,920,000,0001,926,000,0001,920,000,000     
Earnings per common share$ 0.65$ 0.46$ 1.78$ 1.25     
Diluted earnings per common share$ 0.64$ 0.45$ 1.77$ 1.24     
Earnings per Share (Textual) [Abstract]         
Options outstanding of common shares    60,000,00065,000,00054,000,00056,000,000 
Earnings Per Share Additional (Textual) [Abstract]         
Company exchanged depositary shares representing an ownership interest        5,746
Percentage of outstanding income trust securities exchanged for company's preferred stock        46.00%