Condensed Consolidated Statements Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 17, 2013	Feb. 12, 2012	Feb. 17, 2013	Feb. 12, 2012
REVENUE
Net sales	$ 24,343	$ 22,508	$ 47,547	$ 43,689
Membership fees	528	459	1,039	906
Total revenue	24,871	22,967	48,586	44,595
OPERATING EXPENSES
Merchandise costs	21,766	20,139	42,492	39,070
Selling, general and administrative	2,361	2,178	4,693	4,322
Preopening expenses	6	6	24	16
Operating income	738	644	1,377	1,187
OTHER INCOME (EXPENSE)
Interest expense	(25)	(27)	(38)	(54)
Interest income and other, net	26	10	46	47
INCOME BEFORE INCOME TAXES	739	627	1,385	1,180
Provision for income taxes	185	215	410	440
Net income including noncontrolling interests	554	412	975	740
Net income attributable to noncontrolling interests	(7)	(18)	(12)	(26)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 547	$ 394	$ 963	$ 714
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic	$ 1.26	$ 0.91	$ 2.22	$ 1.64
Diluted	$ 1.24	$ 0.90	$ 2.19	$ 1.62
Shares used in calculation (000's)
Basic	435,975	434,535	434,698	434,374
Diluted	439,812	439,468	439,222	440,036
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 7.275	$ 0.240	$ 7.550	$ 0.480