Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to U.S. Bancorp	$ 1,531		$ 1,982		$ 3,088		$ 4,262
Preferred dividends	(59)	[1]	(58)	[2]	(143)	[3]	(148)	[4]
Impact of preferred stock call							(5)
Earnings allocated to participating stock awards	(8)		(10)		(15)		(20)
Net income applicable to U.S. Bancorp common shareholders	$ 1,464		$ 1,914		$ 2,930		$ 4,089
Average common shares outstanding	1,486		1,489		1,485		1,495
Net effect of the exercise and assumed purchase of stock awards	1		1		1		2
Average diluted common shares outstanding	1,487		1,490		1,486		1,497
Earnings per common share	$ 0.99		$ 1.29		$ 1.97		$ 2.73
Diluted earnings per common share	$ 0.99		$ 1.28		$ 1.97		$ 2.73

[1] Reflects dividends declared per share on the Company’s Series A, Series B, Series K, Series L, Series M, Series N and Series O Non-Cumulative Perpetual Preferred Stock of $884.722, $221.181, $343.75, $234.375, $250.00, $231.25 and $281.25 respectively.

[2] Reflects dividends declared per share on the Company’s Series A, Series B, Series F, Series K, Series L and Series M Non-Cumulative Perpetual Preferred Stock of $884.722, $221.181, $406.25, $343.75, $234.375 and $250.00 respectively.

[3] Reflects dividends declared per share on the Company’s Series A, Series B, Series J, Series K, Series L, Series M, Series N and Series O Non-Cumulative Perpetual Preferred Stock of $1,759.722, $439.931, $662.50, $687.50, $468.75, $500.00, $462.50 and $487.50 respectively.

[4] Reflects dividends declared per share on the Company’s Series A, Series B, Series F, Series I, Series J, Series K, Series L and Series M Non-Cumulative Perpetual Preferred Stock of $1,759.722, $439.931, $812.50, $232.953, $662.50, $687.50, $468.75 and $452.778 respectively.