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STOCK-BASED COMPENSATION PLANS | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION PLANS | NOTE 11. STOCK-BASED COMPENSATION PLANS The table below summarizes the components of total stock-based compensation (in millions):
| 2015 |  | 2014 |  | 2013
Stock options | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |
Stock awards | 11 |  |  | 10 |  |  | 10 |
Deferred stock awards | 1 |  |  | 1 |  |  | 1 |
Employee stock purchase plan | 3 |  |  | 2 |  |  | 2 |
Stock-based compensation | $ | 17 |  |  | $ | 16 |  |  | $ | 16 |
Tax benefit related to stock-based compensation | $ | 7 |  |  | $ | 6 |  |  | $ | 6 |
Unrecognized stock-based compensation for non-vested options and awards and the weighted-average period the expense will be recognized (in millions):
| Amount |  | Weighted- Average Period
Stock options | $ | 3 |  |  | 1.0
Stock awards | 8 |  |  | 0.7
Unrecognized stock-based compensation | $ | 11 |  |  | 0.7
The Company has various equity incentive plans under which it may grant stock awards to directors, officers and employees. The Company also has an employee stock purchase plan (ESPP). The Company is authorized to issue 36 million shares of common stock under these plans, of which 16,353,597 shares remain available for future grants of either options or stock awards as of December 31, 2015. Stock Options Stock options to purchase common stock are granted at the fair market value of the stock on the date of grant. The stock options granted have terms of up to ten years. The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used for grants:
| 2015 |  | 2014 |  | 2013
Expected volatility | 53 | % |  | 65 | % |  | 67 | %
Expected term | 6 years |  |  | 6 years |  |  | 6 years |
Risk-free interest rate | 1.67 | % |  | 1.87 | % |  | 1.1 | %
Expected dividend yield | 1.25 | % |  | 1.25 | % |  | — |
Weighted-average grant date fair value per share | $ | 28.71 |  |  | $ | 21.70 |  |  | $ | 14.74 |
Estimated fair value of options granted (millions) | $ | 3 |  |  | $ | 3 |  |  | $ | 3 |
The expected market price volatility is based on the historical volatility. The expected term is based on the estimated period of time until exercise based on historical experience. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of the grant. The expected dividend yield is based on the estimated weighted average dividend yield over the expected term. The expected forfeiture rates are based on historical experience. The tables below summarize stock option activity for the year ended December 31, 2015:
| Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Contractual Life (Years) |  | Aggregate Intrinsic Value (in millions)
Outstanding, December 31, 2014 | 707,688 |  |  | $ | 21.57 |  |  | 6.4 |  | $ | 27 |
Granted | 93,660 |  |  | 65.30 |  |  |  |  |
Exercised | (255,717 | ) |  | 15.97 |  |  |  |  |
Canceled | (1 | ) |  | 38.76 |  |  |  |  |
Forfeited or expired | (5,285 | ) |  | 44.56 |  |  |  |  |
Outstanding, December 31, 2015 | 540,345 |  |  | $ | 31.58 |  |  | 6.3 |  | $ | 26 |
Exercisable, December 31, 2015 | 195,873 |  |  | $ | 18.62 |  |  | 5.6 |  | $ | 12 |
Vested or expected to vest, December 31, 2015 | 539,868 |  |  | $ | 31.57 |  |  | 6.3 |  | $ | 26 |
(in millions) | 2015 |  | 2014 |  | 2013
Intrinsic value of option exercises | $ | 14 |  |  | $ | 20 |  |  | $ | 19 |
Cash received from stock option exercises | 4 |  |  | 6 |  |  | 8 |
Tax benefit related to stock option exercises | 5 |  |  | 7 |  |  | 7 |
Fair value of options vested | 3 |  |  | 2 |  |  | 3 |
Stock Awards Restricted Stock Units (RSUs) are awarded to eligible employees and entitle the grantee to receive shares of common stock at the end of the vest period. The fair value of the RSUs is based on the stock price on the date of grant. The RSUs “cliff vest” after three years, or the period from the date of grant to the employee’s retirement eligibility, and expense is recognized accordingly. Performance Share Units (PSUs) are awarded to certain executives to receive shares of common stock if specific performance goals and market conditions are achieved. There are several tranches of PSUs which vest when performance goals and market conditions are met. The following table summarizes information about outstanding stock awards:
| Number of Units |  | Weighted- Average Grant Date Fair Value |  | Weighted- Average Contractual Life (Years) |  | Aggregate Intrinsic Value (in millions)
Non-vested, December 31, 2014 | 1,027,390 |  |  | $ | 26.19 |  |  | 0.6 |  | $ | 61 |
Granted | 244,874 |  |  | 50.94 |  |  |  |  |  |
Vested | (764,322 | ) |  | 26.33 |  |  |  |  |  |
Forfeited | (37,227 | ) |  | 35.86 |  |  |  |  |  |
Non-vested, December 31, 2015 | 470,715 |  |  | $ | 38.09 |  |  | 0.8 |  | $ | 38 |
Deferred Stock Awards Deferred Stock Units (DSUs) are awarded to members of its Board of Directors as part of their retainers. The underlying common shares are issued upon retirement from the Board, but require no future service period. As a result, the entire intrinsic value of the awards is expensed on the date of grant. Employee Stock Purchase Plan (ESPP) The ESPP allows employees to purchase common stock at 85% of the stock price on the first day of the offering period or the specified purchase date, whichever is lower. Employees may contribute up to 10% of their base earnings during the offering period to purchase stock. Employees purchased 281,058, 298,283, and 171,227 shares in 2015, 2014, and 2013 under the ESPP.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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