Condensed Consolidated Statements Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 12, 2013	May 06, 2012	May 12, 2013	May 06, 2012
REVENUE
Net sales	$ 23,552	$ 21,849	$ 71,099	$ 65,538
Membership fees	531	475	1,570	1,381
Total revenue	24,083	22,324	72,669	66,919
OPERATING EXPENSES
Merchandise costs	21,038	19,543	63,530	58,613
Selling, general and administrative	2,313	2,152	7,006	6,474
Preopening expenses	10	6	34	22
Operating income	722	623	2,099	1,810
OTHER INCOME (EXPENSE)
Interest expense	(25)	(19)	(63)	(73)
Interest income and other, net	15	18	61	65
INCOME BEFORE INCOME TAXES	712	622	2,097	1,802
Provision for income taxes	248	217	658	657
Net income including noncontrolling interests	464	405	1,439	1,145
Net income attributable to noncontrolling interests	(5)	(19)	(17)	(45)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 459	$ 386	$ 1,422	$ 1,100
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 1.05	$ 0.89	$ 3.27	$ 2.53
Diluted (in dollars per share)	$ 1.04	$ 0.88	$ 3.23	$ 2.50
Shares used in calculation (000's)
Basic (shares)	436,488	433,791	435,293	434,180
Diluted (shares)	440,780	439,166	439,738	439,748
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.31	$ 0.00	$ 7.86	$ 0.48