Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Aug. 29, 2021	Aug. 30, 2020	Sep. 01, 2019
REVENUE
Total revenue	$ 195,929	$ 166,761	$ 152,703
OPERATING EXPENSES
Merchandise costs	170,684	144,939	132,886
Selling, general and administrative	18,461	16,332	14,994
Preopening expenses	76	55	86
Operating Income	6,708	5,435	4,737
OTHER INCOME (EXPENSE)
Interest expense	(171)	(160)	(150)
Interest income and other, net	143	92	178
INCOME BEFORE INCOME TAXES	6,680	5,367	4,765
Income Tax Expense (Benefit)	1,601	1,308	1,061
Net income including noncontrolling interests	5,079	4,059	3,704
Net income attributable to noncontrolling interests	(72)	(57)	(45)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 5,007	$ 4,002	$ 3,659
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 11.30	$ 9.05	$ 8.32
Diluted (in dollars per share)	$ 11.27	$ 9.02	$ 8.26
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (shares)	443,089	442,297	439,755
Diluted (shares)	444,346	443,901	442,923
Net sales
REVENUE
Total revenue	$ 192,052	$ 163,220	$ 149,351
Membership fees
REVENUE
Total revenue	$ 3,877	$ 3,541	$ 3,352