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
	Aug. 28, 2022	Aug. 29, 2021	Aug. 30, 2020
Earnings Per Share [Abstract]
NET INCOME ATTRIBUTABLE TO COSTCO	$ 5,844	$ 5,007	$ 4,002
Weighted average number of common shares used in basic net income per common share	443,651	443,089	442,297
RSUs and other	1,106	1,257	1,604
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share	444,757	444,346	443,901