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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Stock Option [Member]	Jun. 30, 2010 Stock Option [Member]	Jun. 30, 2011 Stock Option [Member]	Jun. 30, 2010 Stock Option [Member]	Jun. 10, 2010 Series A
Components of earnings per share
Net income attributable to U.S. Bancorp	$ 1,203	$ 766	$ 2,249	$ 1,435
Preferred stock dividends	(30)	(18)	(69)	(37)
Equity portion of gain on ITS exchange transaction, net of tax.	0	118	0	118
Earnings allocated to participating stock awards	(6)	(4)	(10)	(6)
Net income applicable to U.S. Bancorp common shareholders	$ 1,167	$ 862	$ 2,170	$ 1,510
Average common shares outstanding	1,921	1,912	1,920	1,911
Net effect of the exercise and assumed purchase of stock awards and conversion of outstanding convertible notes	8	9	9	9
Average diluted common shares outstanding	1,929	1,921	1,929	1,920
Earnings per common share	$ 0.61	$ 0.45	$ 1.13	$ 0.79
Diluted earnings per common share	$ 0.60	$ 0.45	$ 1.12	$ 0.79
Earnings per Share (Textuals) [Abstract]
Options outstanding of common shares					55	56	55	56
Earnings Per Share Additional (Textuals) [Abstract]
Company exchanged depositary shares representing an ownership interest									5,746
Percentage of outstanding Income Trust Securities issued by Company's capital third party									46.00%