U.S. Bancorp (Parent Company) (Details Textual) (USD $) In Billions, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Parent Company Information (Textual) [Abstract]
Loan Limits to the company or Individual affiliate	10.00%
Maximum limit of loans to the Company and all affiliates	20.00%
Dividends available to the parent company	$ 6.6

Carrying amount as of the balance sheet date of dividends declared but not received.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DividendsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant