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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company recorded stock-based compensation expense of $7 million and $4 million ($5 million and $3 million, net of tax) during the three months ended June 30, 2018 and 2017, respectively, and $12 million and $5 million ($9 million and $3 million, net of tax) during the six months ended June 30, 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) | (359 | ) |  | 35.14 |  |  |  |  |
|  | Forfeited | (39 | ) |  | 34.98 |  |  |  |  |
| Outstanding and expected to vest at June 30, 2018(c) | 1,079 |  |  | $ | 38.47 |  |  | 1.1 |  | $ | 35 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2018 | 994 |  |  | $ | 33.06 |  |  |  |  |
|  | Granted (a) | 349 |  |  | 48.72 |  |  |  |  |
|  | Vested | — |  |  | — |  |  |  |  |
|  | Forfeited | (145 | ) |  | 53.36 |  |  |  |  |
| Outstanding at June 30, 2018 | 1,198 |  |  | $ | 35.17 |  |  | 1.5 |  | $ | 39 |
| Outstanding and expected to vest at June 30, 2018(c) | 266 |  |  | $ | 44.49 |  |  | 2.3 |  | $ | 9 |
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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 six months ended June 30, 2017 was $34.41.
(b) | The total fair value of RSUs vested during June 30, 2018 and 2017 was $13 million and $22 million, respectively.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $41 million and will be recognized over a weighted average vesting period of 1.3 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 | (186 | ) |  | 9.99 |  |  |  |  | 7 |
| Forfeited/expired | — |  |  | — |  |  |  |  |  |
Outstanding and exercisable at June 30, 2018 | 87 |  |  | $ | 0.79 |  |  | 0.6 |  | $ | 3 |

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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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