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Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Millions
Total
Total Costco Stockholders' Equity
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Noncontrolling Interests
Common stock at beginning of period (shares) at Aug. 31, 2014     437,683        
Equity at beginning of period at Aug. 31, 2014 $ 12,515 $ 12,303 $ 2 $ 4,919 $ (76) $ 7,458 $ 212
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 2,409 2,377       2,377 32
Foreign-currency translation adjustment and other, net (1,063) (1,045)     (1,045)   (18)
Stock-based compensation 394 394   394      
Stock options exercised, including tax effects (shares)     989        
Stock options exercised, including tax effects 69 69   69      
Release of vested RSUs, including tax effects (shares)     2,736        
Release of vested RSUs, including tax effects $ (122) (122)   (122)      
Stock Repurchased and Retired During Period, Shares 3,456   3,456        
Stock Repurchased and Retired During Period, Value $ 494 494   42   452  
Cash dividends declared and other (2,865) (2,865)       (2,865)  
Common stock at end of period (shares) at Aug. 30, 2015     437,952        
Equity at end of period at Aug. 30, 2015 10,843 10,617 $ 2 5,218 (1,121) 6,518 226
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 2,376 2,350       2,350 26
Foreign-currency translation adjustment and other, net 26 22     22   4
Stock-based compensation 459 459   459      
Stock options exercised, including tax effects (shares)     4        
Stock options exercised, including tax effects 0 0   0      
Release of vested RSUs, including tax effects (shares)     2,749        
Release of vested RSUs, including tax effects (146) (146)   (146)      
Conversion of convertible notes (shares)     3        
Conversion of convertible notes $ 0 0 $ 0 0      
Stock Repurchased and Retired During Period, Shares 3,184   3,184        
Stock Repurchased and Retired During Period, Value $ 477 477   41   436  
Cash dividends declared and other $ (749) (746)       (746) (3)
Common stock at end of period (shares) at Aug. 28, 2016 437,524   437,524        
Equity at end of period at Aug. 28, 2016 $ 12,332 12,079 $ 2 5,490 (1,099) 7,686 253
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 2,714 2,679       2,679 35
Foreign-currency translation adjustment and other, net 98 85     85   13
Stock-based compensation 518 518   518      
Release of vested RSUs, including tax effects (shares)     2,673        
Release of vested RSUs, including tax effects (165) (165)   (165)      
Conversion of convertible notes (shares)     5        
Conversion of convertible notes $ 0 0 $ 0 0      
Stock Repurchased and Retired During Period, Shares 2,998   2,998        
Stock Repurchased and Retired During Period, Value $ 473 473   41   432  
Stockholders' Equity, Other     $ 2 (2)      
Cash dividends declared and other $ (3,945) (3,945)       (3,945)  
Common stock at end of period (shares) at Sep. 03, 2017 437,204   437,204        
Equity at end of period at Sep. 03, 2017 $ 11,079 $ 10,778 $ 4 $ 5,800 $ (1,014) $ 5,988 $ 301