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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company recorded stock-based compensation expense of $6 million and $6 million ($4 million and $4 million, net of tax) during the three months ended June 30, 2016 and 2015, respectively, and $14 million and $11 million ($9 million and $7 million, net of tax) during the six months ended June 30, 2016 and 2015, respectively. In jurisdictions with net operating loss carryforwards, exercises and/or vestings of stock-based awards have generated $106 million of total tax deductions at June 30, 2016. Approximately $41 million of tax benefits will be recorded in additional paid-in capital when these tax deductions are realized in these jurisdictions. The weighted average assumptions used in the Monte Carlo simulation model to calculate the fair value of the Company’s stock unit awards containing a market condition were as follows:
| Six Months Ended June 30,
| 2016 |  | 2015
Expected volatility of stock price | 46% |  | 37%
Risk-free interest rate | 0.99% |  | 0.74%
Valuation period | 3 years |  | 3 years
Dividend yield | 0.0% |  | 0.0%
The activity related to the Company’s restricted stock units (“RSUs”) 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, 2016 (a) | 819 |  |  | $ | 43.34 |  |  | 941 |  |  | $ | 35.18 |  |  | 111 |  |  | $ | 18.04 |
| Granted | 584 |  |  | 25.86 |  |  | 526 |  |  | 23.29 |  |  | — |  |  | — |
| Vested (b) | (377 | ) |  | 34.93 |  |  | (486 | ) |  | 25.12 |  |  | (111 | ) |  | 18.04 |
| Forfeited/expired | (13 | ) |  | 39.02 |  |  | (41 | ) |  | 24.04 |  |  | — |  |  | — |
Outstanding at June 30, 2016 (c) | 1,013 |  |  | $ | 36.45 |  |  | 940 |  |  | $ | 34.20 |  |  | — |  |  | $ | — |
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(a) | Reflects the maximum number of stock units assuming achievement of all time-, performance- and market-vesting criteria and does not include those for non-employee directors. The weighted-average fair value of time-based RSUs and performance-based and market-based RSUs granted during the six months ended June 30, 2015 was $61.17 and $55.51, respectively.
(b) | The total grant date fair value of RSUs vested during the six months ended June 30, 2016 and 2015 was $25 million and $24 million, respectively. The total grant date fair value of cash units vested during the six months ended June 30, 2016 and 2015 was $2 million in each period.
(c) | The Company’s outstanding time-based RSUs and performance-based and market-based RSUs had aggregate intrinsic values of $33 million and $30 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $41 million and will be recognized over a weighted average vesting period of 1.5 years. The Company assumes that substantially all outstanding awards will vest over time.
The 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, 2016 | 827 |  |  | $ | 2.87 |  |  | $ | 28 |  |  | 3.3
| Granted | — |  |  | — |  |  |  |  |
| Exercised | (6 | ) |  | 0.79 |  |  | — |  |  |
| Forfeited/expired | — |  |  | — |  |  |  |  |
Outstanding and exercisable at June 30, 2016 | 821 |  |  | $ | 2.88 |  |  | $ | 24 |  |  | 2.8

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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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