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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,069,000 |  |  |  | 6,987,000 |  |  |  | 3,069,000 | 6,987,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 32.32 |  |  |  | $ 36.61 |  |  |  | $ 32.32 | $ 36.61 |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted |  |  |  |  |  |  |  |  | $ 999 | $ 1,207 | $ 807
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 300,400,000 | 318,500,000 | 346,500,000
Effect of Potentially Dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stock options and other |  |  |  |  |  |  |  |  | 6,700,000 | 4,100,000 | 4,200,000
Weighted-average common shares outstanding, assuming dilution (in shares) |  |  |  |  |  |  |  |  | 307,100,000 | 322,600,000 | 350,700,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 0 | 4,500,000 | 8,900,000
Earnings per share attributable to Best Buy Co., Inc. |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.33 | $ 3.79 | $ 2.33
Diluted (in dollars per share) | $ 1.23 | $ 0.78 | $ 0.67 | $ 0.60 | $ 1.91 | $ 0.60 | $ 0.56 | $ 0.69 | $ 3.26 | $ 3.74 | $ 2.30
In the Money Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 2,400,000.0 |  |  |  |  |  |  |  | 2,400,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 30.40 |  |  |  |  |  |  |  | $ 30.40 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number | 700,000.0 |  |  |  |  |  |  |  | 700,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price | $ 39.71 |  |  |  |  |  |  |  | $ 39.71 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,100,000.0 |  |  |  |  |  |  |  | 3,100,000.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 32.32 |  |  |  |  |  |  |  | $ 32.32 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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