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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2018
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 and $1 million ($4 million and $0 million, net of tax) during the three months ended March 31, 2018 and 2017, respectively. 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, 2018 | 1,160 |  |  | $ | 34.54 |  |  |  |  |
|  | Granted (a) | 317 |  |  | 48.66 |  |  |  |  |
|  | Vested (b) | (357 | ) |  | 35.20 |  |  |  |  |
|  | Forfeited | (28 | ) |  | 33.12 |  |  |  |  |
| Outstanding and expected to vest at March 31, 2018 (c) | 1,092 |  |  | $ | 38.45 |  |  | 1.3 |  | $ | 51 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2018 | 994 |  |  | $ | 33.06 |  |  |  |  |
|  | Granted (a) | 349 |  |  | 48.72 |  |  |  |  |
|  | Vested | — |  |  | — |  |  |  |  |
|  | Forfeited | (138 | ) |  | 54.00 |  |  |  |  |
| Outstanding at March 31, 2018 | 1,205 |  |  | $ | 35.20 |  |  | 1.8 |  | $ | 56 |
| Outstanding and expected to vest at March 31, 2018 (c) | 269 |  |  | $ | 44.47 |  |  | 2.6 |  | $ | 13 |
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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, 2017 was $34.41.
(b) | The total fair value of RSUs vested during March 31, 2018 and 2017 was $13 million and $19 million, respectively.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $48 million and will be recognized over a weighted average vesting period of 1.6 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, 2018 | 273 |  |  | $ | 7.08 |  |  | 1.7 |  | $ | 10 |
| Granted | — |  |  | — |  |  |  |  |  |
| Exercised | (167 | ) |  | 11.04 |  |  |  |  | 6 |
| Forfeited/expired | — |  |  | — |  |  |  |  |  |
Outstanding and exercisable at March 31, 2018 | 106 |  |  | $ | 0.79 |  |  | 0.8 |  | $ | 5 |

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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