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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	3 Months Ended						4 Months Ended		12 Months Ended
	May 13, 2018	Feb. 18, 2018	Nov. 26, 2017	May 07, 2017	Feb. 12, 2017	Nov. 20, 2016	Sep. 02, 2018	Sep. 03, 2017	Sep. 02, 2018	Sep. 03, 2017	Aug. 28, 2016
Earnings Per Share [Abstract]
NET INCOME ATTRIBUTABLE TO COSTCO	$ 750	$ 701	$ 640	$ 700	$ 515	$ 545	$ 1,043	$ 919	$ 3,134	$ 2,679	$ 2,350
Weighted average number of common shares used in basic net income per common share	438,740	439,022	437,965	438,817	439,127	438,007	438,379	437,987	438,515	438,437	438,585
RSUs and other									3,319	2,500	2,678
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share	441,715	441,568	440,851	441,056	440,657	440,525	442,427	441,036	441,834	440,937	441,263

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