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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock Based Compensation Activity | 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.
Summary Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range | 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 Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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