Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions		Total	Common Stock [Member]	Preferred Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total U.S. Bancorp Shareholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2016		$ 47,933	$ 21	$ 5,501	$ 8,440	$ 50,151	$ (15,280)	$ (1,535)	$ 47,298	$ 635
Shares, Beginning Balance at Dec. 31, 2016			1,697
Net income (loss)		4,567				4,536			4,536	31
Other comprehensive income (loss)		316						316	316
Preferred stock dividends		(204)				(204)			(204)
Common stock dividends		(1,450)				(1,450)			(1,450)
Issuance of preferred stock		993		993					993
Redemption of preferred stock		(1,085)		(1,075)		(10)			(1,085)
Issuance of common and treasury stock		142			(115)		257		142
Issuance of common and treasury stock, shares			7
Purchase of treasury stock		(1,955)					(1,955)		(1,955)
Purchase of treasury stock, shares			(37)
Distributions to noncontrolling interests		(41)								(41)
Net other changes in noncontrolling interests		3								3
Stock option and restricted stock grants		132			132				132
Ending Balance at Sep. 30, 2017		49,351	$ 21	5,419	8,457	53,023	(16,978)	(1,219)	48,723	628
Shares, Ending Balance at Sep. 30, 2017			1,667
Beginning Balance at Dec. 31, 2017		49,666	$ 21	5,419	8,464	54,142	(17,602)	(1,404)	49,040	626
Shares, Beginning Balance at Dec. 31, 2017			1,656
Change in accounting principles at Dec. 31, 2017	[1]	(1)				299		(300)	(1)
Net income (loss)		5,262				5,240			5,240	22
Other comprehensive income (loss)		(869)						(869)	(869)
Preferred stock dividends		(210)				(210)			(210)
Common stock dividends		(1,593)				(1,593)			(1,593)
Issuance of preferred stock		565		565					565
Issuance of common and treasury stock		77			(130)		207		77
Issuance of common and treasury stock, shares			5
Purchase of treasury stock		(2,019)					(2,019)		(2,019)
Purchase of treasury stock, shares			(38)
Distributions to noncontrolling interests		(22)								(22)
Net other changes in noncontrolling interests		6								6
Stock option and restricted stock grants		145			145				145
Ending Balance at Sep. 30, 2018		$ 51,007	$ 21	$ 5,984	$ 8,479	$ 57,878	$ (19,414)	$ (2,573)	$ 50,375	$ 632
Shares, Ending Balance at Sep. 30, 2018			1,623

[1] Includes the impact of the reduced federal statutory tax rate for corporations included in 2017 tax reform legislation, reclassified out of accumulated other comprehensive income and into retained earnings as of the beginning of the period.