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Shareholders' Equity (Details 2) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Jan. 30, 2016 | Oct. 31, 2015 | Aug. 01, 2015 | May 02, 2015 | Jan. 28, 2017 | Jan. 30, 2016 | Jan. 31, 2015 | Feb. 01, 2014 | Jun. 30, 2011
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from the exercise of stock options (in dollars) |  |  |  |  |  |  |  |  | $ 164 | $ 40 | $ 42 |  |
Weighted-average grant-date fair value of stock options granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 8.04 | $ 11.59 | $ 9.09 |  |
Exercisable stock options (in shares) | 5,900,000 |  |  |  |  |  |  |  | 5,900,000 |  |  |  |
Percentage of exercisable stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 36.64 |  |  |  |  |  |  |  | $ 36.64 |  |  |  |
Unexercisable stock options (in shares) | 1,100,000.0 |  |  |  |  |  |  |  | 1,100,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 36.54 |  |  |  |  |  |  |  | $ 36.54 |  |  |  |
Total outstanding stock options (in shares) | 6,987,000 |  |  |  | 14,242,000 |  |  |  | 6,987,000 | 14,242,000 |  |  |
Percentage of outstanding stock options (as a percent) | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 36.61 |  |  |  | $ 36.51 |  |  |  | $ 36.61 | $ 36.51 |  |  |
Adjustment for assumed dilution: |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | $ 607 | $ 192 | $ 182 | $ 226 | $ 477 | $ 129 | $ 164 | $ 37 | $ 1,207 | $ 807 | $ 1,246 |  |
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 318,500,000 | 346,500,000 | 349,500,000 |  |
Effect of Potentially Dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and other (in shares) |  |  |  |  |  |  |  |  | 4,100,000 | 4,200,000 | 4,100,000 |  |
Weighted-average common shares outstanding, assuming dilution (in shares) |  |  |  |  |  |  |  |  | 322,600,000 | 350,700,000 | 353,600,000 |  |
Earnings per share attributable to Best Buy Co., Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.79 | $ 2.33 | $ 3.57 |  |
Diluted (in dollars per share) | $ 1.91 | $ 0.60 | $ 0.56 | $ 0.69 | $ 1.39 | $ 0.37 | $ 0.46 | $ 0.10 | $ 3.74 | $ 2.30 | $ 3.53 |  |
Share repurchases authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired at ASR Settlement, Shares |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 45 | $ 120 |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | 698 | 1,000 | $ 0 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | $ 279 |  |  |  | $ 271 |  |  |  | 279 | 271 | 382 | $ 485 |
Unrealized gains (losses) on available-for-sale investments | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 7 |
Total | $ 279 |  |  |  | $ 271 |  |  |  | 279 | 271 | 382 | $ 492 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value |  |  |  |  |  |  |  |  | 55 | 14 | 13 |  |
Actual income tax benefit realized from stock option exercises (in dollars) |  |  |  |  |  |  |  |  | $ 19 | $ 5 | $ 5 |  |
In-the-money [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable stock options (in shares) | 2,300,000.0 |  |  |  |  |  |  |  | 2,300,000.0 |  |  |  |
Percentage of exercisable stock options (as a percent) | 39.00% |  |  |  |  |  |  |  | 39.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 26.38 |  |  |  |  |  |  |  | $ 26.38 |  |  |  |
Unexercisable stock options (in shares) | 500,000.0 |  |  |  |  |  |  |  | 500,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 45.00% |  |  |  |  |  |  |  | 45.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 30.84 |  |  |  |  |  |  |  | $ 30.84 |  |  |  |
Total outstanding stock options (in shares) | 2,800,000.0 |  |  |  |  |  |  |  | 2,800,000.0 |  |  |  |
Percentage of outstanding stock options (as a percent) | 40.00% |  |  |  |  |  |  |  | 40.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 27.13 |  |  |  |  |  |  |  | $ 27.13 |  |  |  |
Out-of-the-money [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable stock options (in shares) | 3,600,000.0 |  |  |  |  |  |  |  | 3,600,000.0 |  |  |  |
Percentage of exercisable stock options (as a percent) | 61.00% |  |  |  |  |  |  |  | 61.00% |  |  |  |
Exercisable stock options, weighted-average price (in dollars per share) | $ 43.45 |  |  |  |  |  |  |  | $ 43.45 |  |  |  |
Unexercisable stock options (in shares) | 600,000.0 |  |  |  |  |  |  |  | 600,000.0 |  |  |  |
Percentage of unexercisable stock options (as a percent) | 55.00% |  |  |  |  |  |  |  | 55.00% |  |  |  |
Unexercisable stock options, weighted-average price (in dollars per share) | $ 40.66 |  |  |  |  |  |  |  | $ 40.66 |  |  |  |
Total outstanding stock options (in shares) | 4,200,000.0 |  |  |  |  |  |  |  | 4,200,000.0 |  |  |  |
Percentage of outstanding stock options (as a percent) | 60.00% |  |  |  |  |  |  |  | 60.00% |  |  |  |
Outstanding stock options, weighted-average price (in dollars per share) | $ 43.01 |  |  |  |  |  |  |  | $ 43.01 |  |  |  |
Time-Based Share Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Award, Award Vesting Period, Maximum |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  |  | 25% of the award vests on the date of grant and 25% vests on each of the three anniversary dates thereafter |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  | 2,979,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 32.76 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  |  |  |  | 2,202,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 30.83 |  |  |  |
Unrecognized compensation (in dollars) | $ 98 |  |  |  |  |  |  |  | $ 98 |  |  |  |
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 8 months |  |  |  |
Market-based [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 33.27 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  |  |  |  | 781,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 26.84 |  |  |  |
Unrecognized compensation (in dollars) | 23 |  |  |  |  |  |  |  | $ 23 |  |  |  |
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 8 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 | 200,000 | 300,000 |  |
Open market [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Average share price |  |  |  |  |  |  |  |  |  | $ 31.03 |  |  |
June 2011 share repurchase program [Member} |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Options to Purchase Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounting remaining for additional share repurchases | $ 2,200 |  |  |  |  |  |  |  | $ 2,200 |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased |  |  |  |  |  |  |  |  | 21,100,000 | 32,800,000 |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | $ 751 | $ 1,000 |  |  |
Average share price |  |  |  |  |  |  |  |  | $ 35.54 | $ 30.53 |  |  |
June 2011 share repurchase program [Member} | Open market [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 706 | $ 880 |  |  |
Average share price |  |  |  |  |  |  |  |  | $ 36.11 |  |  |  |
January 2016 ASR [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired at ASR Settlement, Shares |  |  |  |  |  |  |  |  | 1,600,000 | 4,400,000 |  |  |
January 2016 ASR [Domain] | Open market [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Average share price |  |  |  |  |  |  |  |  | $ 28.55 | $ 27.28 |  |  |
Open market [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased |  |  |  |  |  |  |  |  | 19,500,000 | 28,400,000 |  |  |

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