Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to U.S. Bancorp	$ 1,523	$ 1,812	$ 4,582	$ 4,900
Preferred dividends	(102)	(85)	(273)	(228)
Earnings allocated to participating stock awards	(9)	(9)	(24)	(24)
Net income applicable to U.S. Bancorp common shareholders	$ 1,412	$ 1,718	$ 4,285	$ 4,648
Average common shares outstanding	1,548	1,486	1,538	1,485
Net effect of the exercise and assumed purchase of stock awards	1			1
Average diluted common shares outstanding	1,549	1,486	1,538	1,486
Earnings per common share	$ 0.91	$ 1.16	$ 2.79	$ 3.13
Diluted earnings per common share	$ 0.91	$ 1.16	$ 2.79	$ 3.13