Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to U.S. Bancorp	$ 1,171		$ 1,699
Preferred dividends	(78)	[1]	(79)	[2]
Earnings allocated to participating stock awards	(5)		(7)
Net income applicable to U.S. Bancorp common shareholders	$ 1,088		$ 1,613
Average common shares outstanding	1,518		1,602
Net effect of the exercise and assumed purchase of stock awards	1		3
Average diluted common shares outstanding	1,519		1,605
Earnings per common share	$ 0.72		$ 1.01
Diluted earnings per common share	$ 0.72		$ 1.00

[1] Reflects dividends declared per share on the Company’s Series A, Series B, Series F, Series H, Series J and Series K Non-Cumulative Perpetual Preferred Stock of $884.722, $221.18, $406.25, $321.88, $662.50 and $343.75, respectively.

[2] Reflects dividends declared per share on the Company’s Series A, Series B, Series F, Series H, Series J and Series K Non-Cumulative Perpetual Preferred Stock of $951.828, $218.75, $406.25, $321.88, $662.50 and $343.75, respectively.