Earnings Per Share - Components of Earnings per Share (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2010
Earnings Per Share [Line Items]
Company exchanged depositary shares representing an ownership interest	5,746
Percentage of outstanding income trust securities exchanged for company's preferred stock	46.00%

Percentage of outstanding income trust securities exchanged for company's preferred stock.

No definition available.

Name:	usb_PercentageOfOutstandingIncomeTrustSecuritiesExchangedForCompanysPreferredStock
Namespace Prefix:	usb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration