U.S. Bancorp (Parent Company) - Additional Information (Detail)	Dec. 31, 2020
Receivables
Loan Limits to the company or individual affiliate	10.00%
Maximum limit of loans to the Company and all affiliates	20.00%

Maximum Limit of Loans to Company and All Affiliates as Percent of Capital and Surplus

No definition available.

Name:	usb_MaximumLimitOfLoansToCompanyAndAllAffiliatesAsPercentOfCapitalAndSurplus
Namespace Prefix:	usb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant