Basis of Presentation - Line of Business Financial Performance (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Line Of Business Financial Performance [Line Items]
Revenue generated from certain contracts with customers included in non-interest income	$ 1,700	$ 1,800
Payment Services [Member]
Line Of Business Financial Performance [Line Items]
Rewards and rebate costs and certain partner payments included in noninterest income	$ 529	$ 534

Revenue generated from certain contracts with customers included in non-interest income.

No definition available.

Name:	usb_RevenueGeneratedFromCertainContractsWithCustomersIncludedInNoninterestIncome
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration