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Shareholders' Equity (Tables) | 12 Months Ended
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Jan. 28, 2017
Equity [Abstract] |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | A summary of the status of our nonvested performance-based share awards at January 28, 2017, and changes during fiscal 2017, is as follows:
Performance-Based Share Awards |  | Shares |  | Weighted-Average Fair Value per Share
Outstanding at January 30, 2016 |  | — |  |  | $ | — |
Granted |  | 513,000 |  |  | $ | 29.08 |
Forfeited/Canceled |  | (75,000 | ) |  | $ | 29.66 |
Outstanding at January 28, 2017 |  | 438,000 |  |  | $ | 28.98 |
Stock-based compensation expense | Stock-based compensation expense was as follows in fiscal 2017, 2016 and 2015 ($ in millions):
| 2017 |  | 2016 |  | 2015
Stock options | $ | 9 |  |  | $ | 15 |  |  | $ | 17 |
Share awards |  |  |  |  |
Market-based | 15 |  |  | 16 |  |  | 10 |
Performance-based | 6 |  |  | — |  |  | — |
Time-based | 78 |  |  | 73 |  |  | 60 |
Total | $ | 108 |  |  | $ | 104 |  |  | $ | 87 |
Stock option activity | Stock option activity was as follows in fiscal 2017:
| Stock Options |  | Weighted-Average Exercise Price per Share |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 30, 2016 | 14,242,000 |  |  | $ | 36.51 |  |  |  |  |  |
Granted | 224,000 |  |  | $ | 31.79 |  |  |  |  |  |
Exercised | (5,273,000 | ) |  | $ | 31.29 |  |  |  |  |  |
Forfeited/Canceled | (2,206,000 | ) |  | $ | 48.13 |  |  |  |  |  |
Outstanding at January 28, 2017 | 6,987,000 |  |  | $ | 36.61 |  |  | 4.3 |  | $ | 54 |
Vested or expected to vest at January 28, 2017 | 6,987,000 |  |  | $ | 36.61 |  |  | 4.3 |  | $ | 54 |
Exercisable at January 28, 2017 | 5,858,000 |  |  | $ | 36.63 |  |  | 3.5 |  | $ | 46 |
Assumption used to estimate the fair value of stock option on the date of grant using a lattice or Black Scholes model | In fiscal 2017, 2016 and 2015, we estimated the fair value of each stock option on the date of grant using a lattice or Black Scholes valuation model (for certain individuals) with the following assumptions:
Valuation Assumptions(1) |  | 2017 |  | 2016 |  | 2015
Risk-free interest rate(2) |  | 0.5% – 2.0% |  |  | 0.1% – 2.1% |  |  | 0.1% – 2.4% |
Expected dividend yield |  | 3.5 | % |  | 2.3 | % |  | 2.5 | %
Expected stock price volatility(3) |  | 37 | % |  | 37 | % |  | 40 | %
Expected life of stock options (in years)(4) |  | 6.0 |  |  | 6.0 |  |  | 6.0 |
(1) | Forfeitures are estimated using historical experience and projected employee turnover.
(2) | Based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected life of our stock options.
(3) | In projecting expected stock price volatility, we consider both the historical volatility of our stock price as well as implied volatilities from exchange-traded options on our stock.
(4) | We estimate the expected life of stock options based upon historical experience.
Summary of the status of nonvested market-based share awards | A summary of the status of our nonvested market-based share awards at January 28, 2017, and changes during fiscal 2017, is as follows:
Market-Based Share Awards |  | Shares |  | Weighted-Average Fair Value per Share
Outstanding at January 30, 2016 |  | 1,462,000 |  |  | $ | 32.33 |
Granted |  | 1,088,000 |  |  | $ | 29.52 |
Vested |  | (781,000 | ) |  | $ | 26.84 |
Forfeited/Canceled |  | (217,000 | ) |  | $ | 33.27 |
Outstanding at January 28, 2017 |  | 1,552,000 |  |  | $ | 32.99 |
Summary of the status of nonvested time-based share awards | A summary of the status of our nonvested time-based share awards at January 28, 2017, and changes during fiscal 2017, is as follows:
Time-Based Share Awards |  | Shares |  | Weighted-Average Fair Value per Share
Outstanding at January 30, 2016 |  | 5,103,000 |  |  | $ | 31.89 |
Granted |  | 2,979,000 |  |  | $ | 30.68 |
Vested |  | (2,202,000 | ) |  | $ | 30.83 |
Forfeited/Canceled |  | (515,000 | ) |  | $ | 32.76 |
Outstanding at January 28, 2017 |  | 5,365,000 |  |  | $ | 31.57 |
Summary of stock options outstanding | At January 28, 2017, options to purchase 7.0 million shares of common stock were outstanding as follows (shares in millions):
| Exercisable |  | Unexercisable |  | Total
| Shares |  | % |  | Weighted- Average Price per Share |  | Shares |  | % |  | Weighted- Average Price per Share |  | Shares |  | % |  | Weighted- Average Price per Share
In-the-money | 2.3 |  |  | 39 | % |  | $ | 26.38 |  |  | 0.5 |  |  | 45 | % |  | $ | 30.84 |  |  | 2.8 |  |  | 40 | % |  | $ | 27.13 |
Out-of-the-money | 3.6 |  |  | 61 | % |  | $ | 43.45 |  |  | 0.6 |  |  | 55 | % |  | $ | 40.66 |  |  | 4.2 |  |  | 60 | % |  | $ | 43.01 |
Total | 5.9 |  |  | 100 | % |  | $ | 36.64 |  |  | 1.1 |  |  | 100 | % |  | $ | 36.54 |  |  | 7.0 |  |  | 100 | % |  | $ | 36.61 |
Reconciliation of the numerators and denominators of basic and diluted earnings per share | The following table presents a reconciliation of the numerators and denominators of basic and diluted earnings per share from continuing operations attributable to Best Buy Co., Inc. in fiscal 2017, 2016 and 2015 ($ and shares in millions, except per share amounts):
| 2017 |  | 2016 |  | 2015
Numerator (in millions): |  |  |  |  |
Net earnings from continuing operations attributable to Best Buy Co., Inc., shareholders | $ | 1,207 |  |  | $ | 807 |  |  | $ | 1,246 |
Denominator (in millions): |  |  |  |  |
Weighted-average common shares outstanding | 318.5 |  |  | 346.5 |  |  | 349.5 |
Effect of potentially dilutive securities: |  |  |  |  |
Stock options and other | 4.1 |  |  | 4.2 |  |  | 4.1 |
Weighted-average common shares outstanding, assuming dilution | 322.6 |  |  | 350.7 |  |  | 353.6 |
Net earnings per share from continuing operations attributable to Best Buy Co., Inc. shareholders |  |  |  |  |
Basic | $ | 3.79 |  |  | $ | 2.33 |  |  | $ | 3.57 |
Diluted | $ | 3.74 |  |  | $ | 2.30 |  |  | $ | 3.53 |
Repurchases of common stock | The following table presents information regarding the shares we repurchased and retired in fiscal 2017 and 2016, noting that we had no repurchases and retirements in fiscal 2015 ($ and shares in millions, except per share amounts):
| 2017 |  | 2016
Total cost of shares repurchased |  |  |
Open market(1) | $ | 706 |  |  | $ | 880 |
January 2016 ASR | 45 |  |  | 120 |
Total | $ | 751 |  |  | $ | 1,000 |
Average price per share |  |  |
Open market | $ | 36.11 |  |  | $ | 31.03 |
January 2016 ASR | $ | 28.55 |  |  | $ | 27.28 |
Average | $ | 35.54 |  |  | $ | 30.53 |
Number of shares repurchased and retired |  |  |
Open market(1) | 19.5 |  |  | 28.4
January 2016 ASR | 1.6 |  |  | 4.4
Total | 21.1 |  |  | 32.8
(1) | As of January 28, 2017, $8 million, or 0.1 million shares, in trades remained unsettled. The liability for unsettled trades is included in accrued liabilities in the Consolidated Balance Sheets.
Components of accumulated other comprehensive income, net of tax | The following table provides a reconciliation of the components of accumulated other comprehensive income, net of tax, attributable to Best Buy Co., Inc. shareholders for fiscal 2017, 2016, and 2015, respectively ($ in millions):
| Foreign Currency Translation |  | Available-For-Sale Investments(1) |  | Total
Balances at February 1, 2014 | $ | 485 |  |  | $ | 7 |  |  | $ | 492 |
Foreign currency translation adjustments | (103 | ) |  | — |  |  | (103 | )
Unrealized gains on available-for-sale investments | — |  |  | (3 | ) |  | (3 | )
Reclassification of losses on available-for-sale investments into earnings | — |  |  | (4 | ) |  | (4 | )
Balances at January 31, 2015 | 382 |  |  | — |  |  | 382 |
Foreign currency translation adjustments | (44 | ) |  | — |  |  | (44 | )
Reclassification of foreign currency translation adjustments into earnings due to sale of business | (67 | ) |  | — |  |  | (67 | )
Balances at January 30, 2016 | 271 |  |  | — |  |  | 271 |
Foreign currency translation adjustments | 10 |  |  | — |  |  | 10 |
Reclassification of foreign currency translation adjustments into earnings | (2 | ) |  | — |  |  | (2 | )
Balances at January 28, 2017 | $ | 279 |  |  | $ | — |  |  | $ | 279 |
(1) | There were no material tax impacts to gains or losses on available-for-sale investments in the periods presented.

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