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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation |
| Stock-Based Compensation
The Company’s Amended and Restated Equity and Incentive Plan provides for the grant of options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”) and other stock- or cash-based awards to employees, directors and other individuals who perform services for the Company and its subsidiaries. The maximum number of shares reserved for grant of awards under the plan is 18.5 million, with approximately 4.9 million shares available as of December 31, 2015. The Company typically settles stock-based awards with treasury shares. Time-based awards generally vest ratably over a three-year period following the date of grant, and performance- or market-based awards generally vest three years following the date of grant based on the attainment of performance- or market-based goals, all of which are subject to a service condition. Cash Unit Awards The fair value of time-based restricted cash units is based on the Company’s stock price on the grant date. Market-vesting restricted cash units generally vest depending on the level of relative total shareholder return achieved by the Company during the period prior to scheduled vesting. Settlement of restricted cash units is based on the Company’s average closing stock price over a specified number of trading days and the value of these awards varies based on changes in the Company’s stock price. Stock Unit Awards Stock unit awards entitle the holder to receive shares of common stock upon vesting on a one-to-one basis. Performance-based RSUs principally vest based upon the level of performance attained, but vesting can increase by up to 20% if certain relative total shareholder return goals are achieved. Market-based RSUs generally vest based on the level of total shareholder return or absolute stock price attainment. The grant date fair value of the performance-based RSUs incorporates the total shareholder return metric, which is estimated using a Monte Carlo simulation model to estimate the Company’s ranking relative to an applicable stock index. The weighted average assumptions used in the Monte Carlo simulation model to calculate the fair value of the Company’s stock unit awards are outlined in the table below.
| 2015 |  | 2014 |  | 2013
Expected volatility of stock price | 37% |  | 40% |  | 43%
Risk-free interest rate | 0.74% |  | 0.83% |  | 0.39%
Valuation period | 3 years |  | 3 years |  | 3 years
Dividend yield | 0% |  | 0% |  | 0%
Annual activity related to stock units and cash units, consisted of (in thousands of shares):
|  | Time-Based RSUs |  | Performance-Based and Market Based RSUs |  | Cash Unit Awards
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at January 1, 2015 | 998 |  |  | $ | 27.26 |  |  | 1,884 |  |  | $ | 19.17 |  |  | 267 |  |  | $ | 14.90 |
| Granted (a) | 426 |  |  | 54.70 |  |  | 230 |  |  | 55.51 |  |  | — |  |  | — |
| Vested (b) | (563 | ) |  | 23.61 |  |  | (982 | ) |  | 12.05 |  |  | (156 | ) |  | 12.65 |
| Forfeited/expired | (42 | ) |  | 41.07 |  |  | (191 | ) |  | 20.57 |  |  | — |  |  | — |
Outstanding at December 31, 2015 (c) | 819 |  |  | $ | 43.34 |  |  | 941 |  |  | $ | 35.18 |  |  | 111 |  |  | $ | 18.04 |
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(a) | Reflects the maximum number of stock units assuming achievement of all performance-, market- and time-vesting criteria and does not include those for non-employee directors, which are discussed separately below. The weighted-average fair value of time-based RSUs and performance-based and market-based RSUs granted in 2014 was $42.05 and $42.03, respectively, and the weighted-average fair value of time-based RSUs, performance-based and market-based RSUs, and cash units granted in 2013 was $21.77, $20.04 and $18.04, respectively.
(b) | The total fair value of RSUs vested during 2015, 2014 and 2013 was $25 million, $15 million and $13 million, respectively. The total grant date fair value of cash units vested during the year ended December 31, 2015 was $2 million.
(c) | The Company’s outstanding time-based RSUs, performance-based and market-based RSUs, and cash units had aggregate intrinsic value of $30 million, $34 million and $4 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $32 million and will be recognized over a weighted average vesting period of 0.8 years. The Company assumes that substantially all outstanding awards will vest over time.
Stock Options The annual stock option activity consisted of (in thousands of shares):
|  | Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions) |  | Weighted Average Remaining Contractual Term (years)
Outstanding at January 1, 2015 | 848 |  |  | $ | 2.92 |  |  | $ | 54 |  |  | 4.3
| Granted (a) | — |  |  | — |  |  |  |  |  |
| Exercised (b) | (20 | ) |  | 5.28 |  |  | 1 |  |  |
| Forfeited/expired | (1 | ) |  | 0.79 |  |  |  |  |  |
Outstanding and exercisable at December 31, 2015 (c) | 827 |  |  | $ | 2.87 |  |  | $ | 28 |  |  | 3.3
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(a) | No stock options were granted during 2014 or 2013.
(b) | Stock options exercised during 2014 and 2013 had intrinsic values of $6 million and $23 million, respectively, and the cash received from the exercise of options was insignificant in 2015 and 2014 and $3 million in 2013.
(c) | The Company assumes that substantially all outstanding stock options will vest over time.
Non-employee Directors Deferred Compensation Plan The Company grants stock awards on a quarterly basis to non-employee directors representing between 50% and 100% of a director’s annual compensation and such awards can be deferred under the Non-employee Directors Deferred Compensation Plan. During 2015, 2014 and 2013, the Company granted 22,000, 20,000 and 33,000 awards, respectively, to non-employee directors. Employee Stock Purchase Plan The Company is authorized to sell shares of its common stock to eligible employees at 95% of fair market value. This plan has been deemed to be non-compensatory and therefore, no compensation expense has been recognized. Stock-Compensation Expense During 2015, 2014 and 2013, the Company recorded stock-based compensation expense of $26 million ($17 million, net of tax), $34 million ($21 million, net of tax) and $24 million ($14 million, net of tax), respectively. In jurisdictions with net operating loss carryforwards, exercises and/or vestings of stock-based awards have generated $140 million of total tax deductions at December 31, 2015. Approximately $55 million of tax benefits will be recorded in additional paid-in capital when these tax deductions are realized in these jurisdictions.

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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=51659978&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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