Net Income per Common and Common Equivalent Share - Schedule of Earnings per Share Effect on Net Income and Weighted Averegae Number of Dilutive Potential Common Stock (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Sep. 03, 2023	Aug. 28, 2022	Aug. 29, 2021
Earnings Per Share [Abstract]
NET INCOME ATTRIBUTABLE TO COSTCO	$ 6,292	$ 5,844	$ 5,007
Weighted average number of common shares used in basic net income per common share	443,854	443,651	443,089
RSUs and other	598	1,106	1,257
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share	444,452	444,757	444,346