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Note 12. Stock-Based Compensation Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Market Performance Unit Award Valuation Assumptions |
| 2015 RTSR PSU
Weighted average grant date fair value | $ | 41.08 |
Weighted average expected volatility | 25.1 | %
Weighted average volatility of XHB | 21.1 | %
Weighted average correlation coefficient | 0.57 |
Weighted average risk-free interest rate | 1.0 | %
Weighted average dividend yield | — |
Schedule of Nonvested Share Activity | A summary of restricted stock and restricted stock unit activity for the year ended December 31, 2015 is presented below (number of shares in millions):
| Restricted Stock | Weighted Average Grant Date Fair Value |  | Restricted Stock Units | Weighted Average Grant Date Fair Value
Unvested at January 1, 2015 | 0.09 |  | $ | 27.14 |  |  | 0.74 |  | $ | 45.83 |
Granted | — |  | — |  |  | 0.63 |  | 46.40 |
Vested (a) | (0.09 | ) | 27.14 |  |  | (0.31 | ) | 45.13 |
Forfeited | — |  | — |  |  | (0.04 | ) | 46.31 |
Unvested at December 31, 2015 | — |  | $ | — |  |  | 1.02 |  | $ | 46.36 |
_______________
(a) | The total fair value of restricted stock and restricted stock units which vested during the year ended December 31, 2015 was $2 million and $14 million, respectively.
A summary of performance share unit activity for the year ended December 31, 2015 is presented below (number of shares in millions):
| Performance Share Units (a) | Weighted Average Grant Date Fair Value
Unvested at January 1, 2015 | 0.37 |  | $ | 46.63 |
Granted | 0.52 |  | 43.69 |
Vested (b) | (0.03 | ) | 43.72 |
Unvested at December 31, 2015 | 0.86 |  | $ | 44.97 |
_______________
(a) | The PSU amounts 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, 2015 was approximately $1 million.
Summary of Stock Options Valuation Assumptions |
| 2015 Options |  | 2014 Options |  | 2013 Options
Weighted average grant date fair value | $ | 17.66 |  |  | $ | 18.35 |  |  | $ | 19.78 |
Weighted average expected volatility | 36.1 | % |  | 41.5 | % |  | 43.6 | %
Weighted average expected term (years) | 6.25 |  |  | 6.25 |  |  | 6.25 |
Weighted average risk-free interest rate | 1.6 | % |  | 1.4 | % |  | 1.7 | %
Weighted average dividend yield | — |  |  | — |  |  | — |
Summary of Stock Options Activity | A summary of stock option unit activity for the year ended December 31, 2015 is presented below (number of shares in millions):
| Options |  | Weighted Average Exercise Price
Outstanding at January 1, 2015 | 3.22 |  |  | $ | 30.02 |
Granted | 0.18 |  |  | 46.45 |
Exercised (a) (b) | (0.21 | ) |  | 22.09 |
Forfeited/Expired | (0.04 | ) |  | 32.48 |
Outstanding at December 31, 2015 (c) | 3.15 |  |  | $ | 31.42 |
_______________
(a) | The intrinsic value of options exercised during the year ended December 31, 2015 was $5 million.
(b) | Cash received from options exercised during the year ended December 31, 2015 was $5 million.
(c) | Options outstanding at December 31, 2015 had an intrinsic value of $31 million and have a weighted average remaining contractual life of 6.6 years.
Summary of Exercisable Stock Options Activity | The following table summarizes information regarding exercisable stock options as of December 31, 2015:
Range of Exercise Prices |  | Options Vested (a) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
$15.00 to $50.00 |  | 1.98 |  |  | $ | 24.93 |  |  | $ | 24.7 |
$50.00 and above |  | 0.09 |  |  | $ | 140.86 |  |  | — |
_______________
(a) | Exercisable stock options as of December 31, 2015 have a weighted average remaining contractual life of 7.4 years.

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