Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 30, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	US BANCORP \DE\
Entity Central Index Key	0000036104
Document Type	10-Q
Document Period End Date	Dec. 31, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding (actual number of shares)		1,894,190,134