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Note 12. Stock-Based Compensation Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Market Performance Unit Award Valuation Assumptions |
| 2016 RTSR PSU
Weighted average grant date fair value | $ | 27.99 |
Weighted average expected volatility | 28.1 | %
Weighted average volatility of XHB | 19.4 | %
Weighted average correlation coefficient | 0.58 |
Weighted average risk-free interest rate | 0.9 | %
Weighted average dividend yield | — |
Schedule of Nonvested Share Activity | A summary of RSU activity for the year ended December 31, 2016 is presented below (number of shares in millions):
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2016 | 1.0 |  |  | $ | 46.36 |
Granted | 1.0 |  |  | 32.29 |
Vested (a) | (0.5 | ) |  | 45.84 |
Forfeited | (0.1 | ) |  | 37.61 |
Unvested at December 31, 2016 | 1.4 |  |  | $ | 37.53 |
_______________
(a) | The total fair value of RSUs which vested during the year ended December 31, 2016 was $23 million.
A summary of PSU activity for the year ended December 31, 2016 is presented below (number of shares in millions):
| Performance Share Units |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2016 | 0.9 |  |  | $ | 44.97 |
Granted (a) | 0.6 |  |  | 31.89 |
Vested (b) | (0.4 | ) |  | 44.27 |
Forfeited (c) | (0.1 | ) |  | 46.69 |
Unvested at December 31, 2016 | 1.0 |  |  | $ | 36.71 |
_______________
(a) | The PSU amounts granted in the table are shown at the target amount of the award.
(b) | The total fair value of PSUs which vested during the year ended December 31, 2016 was $15 million.
(c) | Includes the difference between PSU's granted at target and amounts earned.
Summary of Stock Options Valuation Assumptions |
| 2016 Options |  | 2015 Options |  | 2014 Options
Weighted average grant date fair value | $ | 10.81 |  |  | $ | 17.66 |  |  | $ | 18.35 |
Weighted average expected volatility | 31.7 | % |  | 36.1 | % |  | 41.5 | %
Weighted average expected term (years) | 6.25 |  |  | 6.25 |  |  | 6.25 |
Weighted average risk-free interest rate | 1.3 | % |  | 1.6 | % |  | 1.4 | %
Weighted average dividend yield | 0.1 | % |  | — |  |  | — |
Summary of Stock Options Activity | A summary of stock option unit activity for the year ended December 31, 2016 is presented below (number of shares in millions):
| Options |  | Weighted Average Exercise Price
Outstanding at January 1, 2016 | 3.2 |  |  | $ | 31.42 |
Granted | 0.3 |  |  | 32.33 |
Exercised (a) (b) | (0.1 | ) |  | 19.86 |
Forfeited/Expired | (0.1 | ) |  | 36.76 |
Outstanding at December 31, 2016 (c) | 3.3 |  |  | $ | 31.73 |
_______________
(a) | The intrinsic value of options exercised during the year ended December 31, 2016 was $1 million.
(b) | Cash received from options exercised during the year ended December 31, 2016 was $2 million.
(c) | Options outstanding at December 31, 2016 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6 years.
Summary of Exercisable Stock Options Activity | The following table summarizes information regarding exercisable stock options as of December 31, 2016:
Range of Exercise Prices |  | Options Vested (a) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
$15.00 to $50.00 |  | 2.63 |  |  | $ | 26.48 |  |  | $ | 6.7 |
$50.00 and above |  | 0.09 |  |  | $ | 140.86 |  |  | $ | — |
_______________
(a) | Exercisable stock options as of December 31, 2016 have a weighted average remaining contractual life of 5.4 years.

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