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Shareholders' Equity (Details 2) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 30, 2016 | Oct. 31, 2015 | Aug. 01, 2015 | May. 02, 2015 | Jan. 31, 2015 | Nov. 01, 2014 | Aug. 02, 2014 | May. 03, 2014 | Jan. 30, 2016 | Jan. 31, 2015 | Feb. 01, 2014 | Feb. 02, 2013 | Jun. 30, 2011
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from the exercise of stock options (in dollars) |  |  |  |  |  |  |  |  | $ 40 | $ 42 | $ 158 |  |
Weighted-average grant-date fair value of stock options granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 11.59 | $ 9.09 | $ 7.77 |  |
Exercisable stock options (in shares) | 11,668,000 |  |  |  |  |  |  |  | 11,668,000 |  |  |  |
Percentage of exercisable stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 37.09 |  |  |  |  |  |  |  | $ 37.09 |  |  |  |
Unexercisable stock options (in shares) | 2,500,000.0 |  |  |  |  |  |  |  | 2,500,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 33.87 |  |  |  |  |  |  |  | $ 33.87 |  |  |  |
Total outstanding stock options (in shares) | 14,242,000 |  |  |  | 17,342,000 |  |  |  | 14,242,000 | 17,342,000 |  |  |
Percentage of outstanding stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 36.51 |  |  |  | $ 36.81 |  |  |  | $ 36.51 | $ 36.81 |  |  |
Adjustment for assumed dilution: |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted |  |  |  |  |  |  |  |  | $ 807 | $ 1,246 | $ 695 |  |
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 346,500,000 | 349,500,000 | 342,100,000 |  |
Effect of Potentially Dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and other (in shares) |  |  |  |  |  |  |  |  | 4,200,000 | 4,100,000 | 5,500,000 |  |
Weighted-average common shares outstanding, assuming dilution (in shares) |  |  |  |  |  |  |  |  | 350,700,000 | 353,600,000 | 347,600,000 |  |
Earnings per share attributable to Best Buy Co., Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.33 | $ 3.57 | $ 2.03 |  |
Diluted (in dollars per share) | $ 1.39 | $ 0.37 | $ 0.46 | $ 0.10 | $ 1.47 | $ 0.33 | $ 0.39 | $ 1.33 | $ 2.30 | $ 3.53 | $ 2.00 |  |
Share repurchases authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 120 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | $ 271 |  |  |  | $ 382 |  |  |  | 271 | $ 382 | $ 485 | $ 113 |
Unrealized gains (losses) on available-for-sale investments | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 7 | (1) |
Total | $ 271 |  |  |  | $ 382 |  |  |  | 271 | 382 | 492 | $ 112 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value |  |  |  |  |  |  |  |  | 14 | 13 | 39 |  |
Actual income tax benefit realized from stock option exercises (in dollars) |  |  |  |  |  |  |  |  | $ 5 | $ 5 | $ 13 |  |
In-the-money [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable stock options (in shares) | 4,200,000.0 |  |  |  |  |  |  |  | 4,200,000.0 |  |  |  |
Percentage of exercisable stock options (as a percent) | 36.00% |  |  |  |  |  |  |  | 36.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 24.73 |  |  |  |  |  |  |  | $ 24.73 |  |  |  |
Unexercisable stock options (in shares) | 1,300,000.0 |  |  |  |  |  |  |  | 1,300,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 52.00% |  |  |  |  |  |  |  | 52.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 27.45 |  |  |  |  |  |  |  | $ 27.45 |  |  |  |
Total outstanding stock options (in shares) | 5,500,000.0 |  |  |  |  |  |  |  | 5,500,000.0 |  |  |  |
Percentage of outstanding stock options (as a percent) | 39.00% |  |  |  |  |  |  |  | 39.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 25.37 |  |  |  |  |  |  |  | $ 25.37 |  |  |  |
Out-of-the-money [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable stock options (in shares) | 7,500,000.0 |  |  |  |  |  |  |  | 7,500,000.0 |  |  |  |
Percentage of exercisable stock options (as a percent) | 64.00% |  |  |  |  |  |  |  | 64.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 44.15 |  |  |  |  |  |  |  | $ 44.15 |  |  |  |
Unexercisable stock options (in shares) | 1,200,000.0 |  |  |  |  |  |  |  | 1,200,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 48.00% |  |  |  |  |  |  |  | 48.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 40.51 |  |  |  |  |  |  |  | $ 40.51 |  |  |  |
Total outstanding stock options (in shares) | 8,700,000.0 |  |  |  |  |  |  |  | 8,700,000.0 |  |  |  |
Percentage of outstanding stock options (as a percent) | 61.00% |  |  |  |  |  |  |  | 61.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 43.62 |  |  |  |  |  |  |  | $ 43.62 |  |  |  |
June 2011 share repurchase program [Member} |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounting remaining for additional share repurchases | $ 3,000 |  |  |  |  |  |  |  | $ 3,000 |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased |  |  |  |  |  |  |  |  | 32,800,000 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Open market [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased |  |  |  |  |  |  |  |  | 28,400,000 |  |  |  |
January 2016 ASR [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |
Market-based [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation (in dollars) | $ 19 |  |  |  |  |  |  |  | $ 19 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period over which compensation expense is expected to be recognized (in years) |  |  |  |  |  |  |  |  | 1 year 10 months |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  | 200,000 | 300,000 | 600,000 |  |
Open market [Domain] | June 2011 share repurchase program [Member} |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 880 |  |  |  |

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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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