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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company recorded stock-based compensation expense of $7 million ($5 million, net of tax) during the three months ended June 30, 2019 and 2018, in each period, and $12 million and ($9 million, net of tax) during the six months ended June 30, 2019 and 2018, in each period. 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) | 485 |  |  | 34.90 |  |  |  |  |
|  | Vested (b) | (361 | ) |  | 35.80 |  |  |  |  |
|  | Forfeited | (55 | ) |  | 38.73 |  |  |  |  |
| Outstanding and expected to vest at June 30, 2019 (c) | 907 |  |  | $ | 37.79 |  |  | 1.3 |  | $ | 32 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2019 | 1,169 |  |  | $ | 35.14 |  |  |  |  |
|  | Granted (a) | 522 |  |  | 34.87 |  |  |  |  |
|  | Vested | — |  |  | — |  |  |  |  |
|  | Forfeited | (430 | ) |  | 24.85 |  |  |  |  |
| Outstanding at June 30, 2019 | 1,261 |  |  | $ | 38.54 |  |  | 1.8 |  | $ | 44 |
| Outstanding and expected to vest at June 30, 2019 (c) | 518 |  |  | $ | 39.96 |  |  | 2.1 |  | $ | 18 |
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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, 2018 was $48.66 and $48.72, respectively.
(b) | The total fair value of RSUs vested during June 30, 2019 and 2018 was $13 million, in each period.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $40 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, 2019 | 57 |  |  | $ | 0.79 |  |  | 0.1 |  |  | $ | 1 |
| Granted | — |  |  | — |  |  |  |  | — |
| Exercised (a) | (57 | ) |  | 0.79 |  |  |  |  | 1 |
| Forfeited/expired | — |  |  | — |  |  |  |  | — |
Outstanding and exercisable at June 30, 2019 | — |  |  | $ | — |  |  | — |  |  | $ | — |
__________ (a) Stock options exercised during the six months ended June 30, 2018 had an intrinsic value of $7 million and the cash received was $2 million.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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