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Net Income per Common and Common Equivalent Share - Schedule of Earnings per Share Effect on Net Income and Weighted Averegae Number of Dilutive Potential Common Stock (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 4 Months Ended | 12 Months Ended
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May 12, 2019 | Feb. 17, 2019 | Nov. 25, 2018 | May 13, 2018 | Feb. 18, 2018 | Nov. 26, 2017 | Sep. 01, 2019 | Sep. 02, 2018 | Sep. 01, 2019 | Sep. 02, 2018 | Sep. 03, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
NET INCOME ATTRIBUTABLE TO COSTCO | $ 906 | $ 889 | $ 767 | $ 750 | $ 701 | $ 640 | $ 1,097 | $ 1,043 | $ 3,659 | $ 3,134 | $ 2,679
Weighted average number of common shares used in basic net income per common share | 439,859 | 440,284 | 439,157 | 438,740 | 439,022 | 437,965 | 439,727 | 438,379 | 439,755 | 438,515 | 438,437
RSUs and other |  |  |  |  |  |  |  |  | 3,168 | 3,319 | 2,500
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share | 442,642 | 442,337 | 442,749 | 441,715 | 441,568 | 440,851 | 443,400 | 442,427 | 442,923 | 441,834 | 440,937

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