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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company recorded stock-based compensation expense of $5 million ($4 million, net of tax) during the three months ended March 31, 2019 and 2018. The activity related to restricted stock units (“RSUs”) consisted of (in thousands of shares):
|  |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Time-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2019 | 838 |  |  | $ | 38.67 |  |  |  |  |
|  | Granted (a) | 422 |  |  | 34.82 |  |  |  |  |
|  | Vested (b) | (336 | ) |  | 35.56 |  |  |  |  |
|  | Forfeited | (27 | ) |  | 39.40 |  |  |  |  |
| Outstanding and expected to vest at March 31, 2019 (c) | 897 |  |  | $ | 38.01 |  |  | 1.4 |  | $ | 31 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2019 | 1,169 |  |  | $ | 35.14 |  |  |  |  |
|  | Granted (a) | 480 |  |  | 34.82 |  |  |  |  |
|  | Vested | — |  |  | — |  |  |  |  |
|  | Forfeited | (413 | ) |  | 24.23 |  |  |  |  |
| Outstanding at March 31, 2019 | 1,236 |  |  | $ | 38.66 |  |  | 2.0 |  | $ | 43 |
| Outstanding and expected to vest at March 31, 2019 (c) | 487 |  |  | $ | 39.81 |  |  | 2.3 |  | $ | 17 |
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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. The weighted-average fair value of time-based RSUs and performance-based RSUs granted during the three months ended March 31, 2018 was $48.66 and $48.72 respectively.
(b) | The total fair value of RSUs vested during March 31, 2019 and 2018 was $12 million and $13 million, respectively.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $45 million and will be recognized over a weighted average vesting period of 1.7 years.
The stock option activity consisted of (in thousands of shares):
|  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2019 | 57 |  |  | $ | 0.79 |  |  | 0.1 |  |  | $ | 1 |
| Granted | — |  |  | — |  |  |  |  | — |
| Exercised (a) | (57 | ) |  | 0.79 |  |  |  |  | 1 |
| Forfeited/expired | — |  |  | — |  |  |  |  | — |
Outstanding and exercisable at March 31, 2019 | — |  |  | $ | — |  |  | — |  |  | $ | — |
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(a) | Stock options exercised during the three months ended March 31, 2018 had an intrinsic value of $6 million and the cash received was $2 million.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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