Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 17, 2019	Feb. 18, 2018	Feb. 17, 2019	Feb. 18, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME INCLUDING NONCONTROLLING INTERESTS	$ 901	$ 713	$ 1,678	$ 1,364
Foreign-currency translation adjustment and other, net	52	150	(82)	127
Comprehensive income	953	863	1,596	1,491
Less: Comprehensive income attributable to noncontrolling interests	13	22	21	33
COMPREHENSIVE INCOME ATTRIBUTABLE TO COSTCO	$ 940	$ 841	$ 1,575	$ 1,458