Earnings per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
May 04, 2013	May 05, 2012
Numerator
Net earnings from continuing operations attributable to Best Buy Co., Inc. shareholders	$ 97	$ 169
Denominator
Weighted-average common shares outstanding (in shares)	339.0	342.2
Effect of potentially dilutive securities:
Nonvested share awards (in shares)	2.0	0.6
Weighted-average common shares outstanding, assuming dilution (in shares)	341.0	342.8
Net earnings per share from continuing operations attributable to Best Buy Co., Inc.
Basic (in dollars per share)	$ 0.29	$ 0.49
Diluted (in dollars per share)	$ 0.29	$ 0.49
Antidilutive securities excluded from computation of earnings per share	25.1	31.7

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