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Employee Stock-based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Expense | The Company recorded stock-based compensation expense for the years ended December 31 as follows:
In millions | 2016 |  | 2015 |  | 2014
Stock options | $ | 9 |  |  | $ | 12 |  |  | $ | 13 |
Restricted shares | 51 |  |  | 41 |  |  | 33 |
Employee share repurchase program | 2 |  |  | 3 |  |  | 4 |
Total stock-based compensation before income taxes | 62 |  |  | 56 |  |  | 50 |
Tax benefit | (13 | ) |  | (17 | ) |  | (16 | )
Total stock-based compensation, net of tax | $ | 49 |  |  | $ | 39 |  |  | $ | 34 |
Fair Value of Each Option Award on the Grant Date Using the Black-Scholes Option-Pricing Model | The fair value of each option award on the grant date was estimated using the Black-Scholes option-pricing model with the following assumptions:
| 2016 |  | 2015 |  | 2014
Dividend yield | — | % |  | — | % |  | — | %
Risk-free interest rate | 2.08 | % |  | 1.76 | % |  | 1.73 | %
Expected volatility | 35.2 | % |  | 34.4 | % |  | 37.8 | %
Expected term (years) | 6.3 |  |  | 6.3 |  |  | 6.3 |
The Company's Stock Option Activity | The following table summarizes the Company’s stock option activity for the year ended December 31, 2016:
Shares in thousands | Shares Under Option |  | Weighted- Average Exercise Price per Share |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2016 | 7,574 |  |  | $ | 34.91 |  |  | 5.7 |  | $ | 20 |
Granted | 1,013 |  |  | $ | 28.17 |  |  |  |  |
Exercised | (1,136 | ) |  | $ | 16.48 |  |  |  |  |
Canceled | (311 | ) |  | $ | 43.48 |  |  |  |  |
Forfeited | (631 | ) |  | $ | 39.63 |  |  |  |  |
Outstanding at December 31, 2016 | 6,509 |  |  | $ | 36.22 |  |  | 5.3 |  | $ | 8 |
Fully vested and expected to vest at December 31, 2016 | 6,509 |  |  | $ | 36.22 |  |  | 5.3 |  | $ | 8 |
Exercisable at December 31, 2016 | 4,487 |  |  | $ | 38.16 |  |  | 3.6 |  | $ | 8 |
Total Intrinsic Value of Options Exercised and The Cash Received | The following table summarizes the total intrinsic value of options exercised and the cash received by the Company from option exercises under all share-based payment arrangements at December 31:
In millions | 2016 |  | 2015 |  | 2014
Intrinsic value of options exercised | $ | 13 |  |  | $ | 8 |  |  | $ | 14 |
Cash received from option exercises | $ | 18 |  |  | $ | 9 |  |  | $ | 11 |
Tax benefit realized from option exercises | $ | 5 |  |  | $ | 3 |  |  | $ | 5 |
Restricted Stock and Restricted Stock Unit Activity | The following table reports restricted shares and restricted share unit activity during the year ended December 31, 2016:
Shares in thousands | Number of Shares |  | Weighted- Average Grant Date Fair Value per Share
Unvested shares at January 1, 2016 | 4,146 |  |  | $ | 38.58 |
Granted | 2,209 |  |  | $ | 26.61 |
Vested | (1,612 | ) |  | $ | 38.09 |
Forfeited/canceled | (701 | ) |  | $ | 33.75 |
Unvested shares at December 31, 2016 | 4,042 |  |  | $ | 31.57 |
Weighted-Average Fair Value and Total Fair Value of Shares Vested | The following table summarizes the weighted-average fair value of restricted share units granted for Teradata equity awards and the total fair value of shares vested.
| 2016 |  | 2015 |  | 2014
Weighted-average fair value of restricted share units granted | $ | 26.61 |  |  | $ | 32.82 |  |  | $ | 44.39 |
Total fair value of shares vested (in millions) | $ | 61 |  |  | $ | 45 |  |  | $ | 27 |
The Composition of Teradata Restricted Stock Grants | The following table represents the composition of Teradata restricted share unit grants in 2016:
Shares in thousands | Number of Shares |  | Weighted- Average Grant Date Fair Value
Service-based shares | 1,566 |  |  | $ | 27.73 |
Performance-based shares | 643 |  |  | $ | 23.90 |
Total stock grants | 2,209 |  |  | $ | 26.61 |
Employee Purchases and Aggregate Cost | Employee purchases and aggregate cost were as follows at December 31:
In millions | 2016 |  | 2015 |  | 2014
Employee share purchases | 0.6 |  |  | 0.5 |  |  | 0.4 |
Aggregate cost | $ | 13 |  |  | $ | 17 |  |  | $ | 18 |

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