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Employee Stock-based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock-Based Compensation Expense | The Company recorded stock-based compensation expense for the years ended December 31 as follows:
In millions |  | 2012 |  |  | 2011 |  |  | 2010 |
Stock options |  | $ | 15 |  |  | $ | 14 |  |  | $ | 12 |
Restricted stock |  |  | 28 |  |  |  | 21 |  |  |  | 14 |
Total stock-based compensation before income taxes |  |  | 43 |  |  |  | 35 |  |  |  | 26 |
Tax benefit |  |  | (14 | ) |  |  | (13 | ) |  |  | (10 | )
Total stock-based compensation, net of tax |  | $ | 29 |  |  | $ | 22 |  |  | $ | 16 |
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:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Dividend yield |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Risk-free interest rate |  |  | 0.87 | % |  |  | 1.63 | % |  |  | 1.88 | %
Expected volatility |  |  | 35.7 | % |  |  | 39.5 | % |  |  | 31.4 | %
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, 2012:
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, 2012 |  |  | 8,282 |  |  | $ | 24.71 |  |  |  | 6.8 |  |  | $ | 199 |
Granted |  |  | 702 |  |  | $ | 61.54 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,304 | ) |  | $ | 18.64 |  |  |  |  |  |  |  |  |
Canceled |  |  | (11 | ) |  | $ | 9.94 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (31 | ) |  | $ | 35.10 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 6,638 |  |  | $ | 30.69 |  |  |  | 6.7 |  |  | $ | 207 |
Fully vested and expected to vest at December 31, 2012 |  |  | 6,605 |  |  | $ | 30.57 |  |  |  | 6.7 |  |  | $ | 207 |
Exercisable at December 31, 2012 |  |  | 4,603 |  |  | $ | 22.69 |  |  |  | 5.8 |  |  | $ | 180 |
Restricted Stock and Restricted Stock Unit Activity | The following table reports restricted stock and restricted stock unit activity during the year ended December 31, 2012:
Shares in thousands |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
Unvested shares at January 1, 2012 |  |  | 1,836 |  |  | $ | 39.71 |
Granted |  |  | 1,101 |  |  | $ | 60.71 |
Vested |  |  | (483 | ) |  | $ | 30.94 |
Forfeited/canceled |  |  | (81 | ) |  | $ | 38.15 |
Unvested shares at December 31, 2012 |  |  | 2,373 |  |  | $ | 51.37 |
The Composition of Teradata Restricted Stock Grants | The following table represents the composition of Teradata restricted stock unit grants in 2012:
Shares in thousands |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Service-based shares |  |  | 614 |  |  | $ | 62.41 |
Performance-based shares |  |  | 487 |  |  | $ | 58.56 |
Total stock grants |  |  | 1,101 |  |  | $ | 60.71 |
Primary Assumptions Used in Valuation of Market Component of Awards | The primary assumptions used in the valuation of the market component of the awards were as follows:
|  | 2012 |
Grant date fair value per share of Company common stock |  | $ | 58.63 |
Expected volatility |  |  | 36.44 | %
Risk-free interest rate |  |  | 0.47 | %
Dividend yield |  |  | 0 |
Performance vesting hurdle - future fair value per share of Company common stock |  | $ | 85.00 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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