Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to U.S. Bancorp	$ 1,699		$ 1,675
Preferred dividends	(79)	[1]	(70)	[2]
Earnings allocated to participating stock awards	(7)		(8)
Net income applicable to U.S. Bancorp common shareholders	$ 1,613		$ 1,597
Average common shares outstanding	1,602		1,652
Net effect of the exercise and assumed purchase of stock awards	3		5
Average diluted common shares outstanding	1,605		1,657
Earnings per common share	$ 1.01		$ 0.97
Diluted earnings per common share	$ 1.00		$ 0.96

[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 $951.828, $218.75, $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 and Series J Non-Cumulative Perpetual Preferred Stock of $875.00, $218.75, $406.25, $321.88 and $662.50, respectively.