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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2015
Aug. 02, 2014
Aug. 01, 2015
Aug. 02, 2014
Numerator        
Net earnings from continuing operations $ 164 $ 137 $ 201 $ 606
Net earnings from continuing operations attributable to Best Buy Co., Inc. $ 164 $ 137 $ 201 $ 606
Denominator        
Weighted-average common shares outstanding (in shares) 349.6 349.3 351.0 348.4
Effect of potentially dilutive securities:        
Nonvested share awards (in shares) 4.3 2.9 4.8 3.2
Weighted-average common shares outstanding, assuming dilution (in shares) 353.9 352.2 355.8 351.6
Net earnings per share from continuing operations attributable to Best Buy Co., Inc.        
Basic (in dollars per share) $ 0.47 $ 0.39 $ 0.57 $ 1.74
Diluted (in dollars per share) $ 0.46 $ 0.39 $ 0.57 $ 1.73
Antidilutive securities excluded from computation of earnings per share 10.4 13.5 10.4 13.5