Leases - Components of Net Investment in Sales-Type and Direct Financing Leases (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Capital Leased Assets [Line Items]
Accumulated allowance for uncollectible minimum lease payments	$ 80	$ 91

Capital leases net investment in sales type and direct financing leases allowance for uncollectible minimum lease payments.

No definition available.

Name:	usb_CapitalLeasesNetInvestmentInSalesTypeAndDirectFinancingLeasesAllowanceForUncollectibleMinimumLeasePayments
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant