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Earnings per Share (Details) (USD $)
In Millions, except Per Share data
3 Months Ended 6 Months Ended
Aug. 27, 2011
Aug. 28, 2010
Aug. 27, 2011
Aug. 28, 2010
Numerator        
Net earnings attributable to Best Buy Co., Inc., basic (in dollars) $ 177 $ 254 $ 313 $ 409
Adjustment for assumed dilution:        
Interest on convertible debentures, net of tax (in dollars) 2 1 3 2
Net earnings attributable to Best Buy Co., Inc., diluted (in dollars) $ 179 $ 255 $ 316 $ 411
Denominator        
Weighted-average common shares outstanding (in shares) 371.9 413.5 379.8 416.9
Effect of potentially dilutive securities:        
Shares from assumed conversion of convertible debentures (in shares) 8.8 8.8 8.8 8.8
Stock options and other (in shares) 0.7 1.3 0.9 2.0
Weighted-average common shares outstanding, assuming dilution (in shares) 381.4 423.6 389.5 427.7
Earnings per share attributable to Best Buy Co., Inc.        
Basic (in dollars per share) $ 0.48 $ 0.61 $ 0.82 $ 0.98
Diluted (in dollars per share) $ 0.47 $ 0.60 $ 0.81 $ 0.96
Antidilutive securities excluded from computation of earnings per share 30.5 23.2 30.5 19.0