Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Feb. 17, 2019	Feb. 18, 2018	Feb. 17, 2019	Feb. 18, 2018
REVENUE
Total Revenue	$ 35,396	$ 32,995	$ 70,465	$ 64,804
OPERATING EXPENSES
Merchandise costs	30,720	28,733	61,343	56,350
Selling, general and administrative	3,464	3,234	6,939	6,458
Preopening expenses	9	12	31	29
Operating income	1,203	1,016	2,152	1,967
OTHER INCOME (EXPENSE)
Interest expense	(34)	(37)	(70)	(74)
Interest income and other, net	46	7	68	29
INCOME BEFORE INCOME TAXES	1,215	986	2,150	1,922
Provision for income taxes	314	273	472	558
Net income including noncontrolling interests	901	713	1,678	1,364
Net income attributable to noncontrolling interests	(12)	(12)	(22)	(23)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 889	$ 701	$ 1,656	$ 1,341
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 2.02	$ 1.60	$ 3.77	$ 3.06
Diluted (in dollars per share)	$ 2.01	$ 1.59	$ 3.74	$ 3.04
Shares used in calculation (000's)
Basic (shares)	440,284	439,022	439,721	438,494
Diluted (shares)	442,337	441,568	442,535	441,201
Net sales
REVENUE
Total Revenue	$ 34,628	$ 32,279	$ 68,939	$ 63,396
Membership fees
REVENUE
Total Revenue	$ 768	$ 716	$ 1,526	$ 1,408