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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock Based Compensation Activity | The Company recorded stock-based compensation expense of $6 million and $7 million ($5 million and $5 million, net of tax) during the three months ended September 30, 2019 and 2018, respectively, and $18 million ($14 million, net of tax) during the nine months ended September 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) | 606 |  |  | 34.17 |  |  |  |  |
|  | Vested (b) | (502 | ) |  | 36.00 |  |  |  |  |
|  | Forfeited | (56 | ) |  | 38.76 |  |  |  |  |
| Outstanding and expected to vest at September 30, 2019 (c) | 886 |  |  | $ | 37.10 |  |  | 1.3 |  | $ | 25 |
Performance-based and market-based RSUs |  |  |  |  |  |  |
| Outstanding at January 1, 2019 | 1,169 |  |  | $ | 35.14 |  |  |  |  |
|  | Granted (a) | 570 |  |  | 34.56 |  |  |  |  |
|  | Vested | — |  |  | — |  |  |  |  |
|  | Forfeited | (430 | ) |  | 24.85 |  |  |  |  |
| Outstanding at September 30, 2019 | 1,309 |  |  | $ | 38.27 |  |  | 1.6 |  | $ | 37 |
| Outstanding and expected to vest at September 30, 2019 (c) | 524 |  |  | $ | 39.31 |  |  | 1.9 |  | $ | 15 |
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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 nine months ended September 30, 2018 was $48.41 and $48.52, respectively.
(b) | The total fair value of RSUs vested during September 30, 2019 and 2018 was $18 million and $20 million, respectively.
(c) | Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $36 million and will be recognized over a weighted average vesting period of 1.5 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 September 30, 2019 | — |  |  | $ | — |  |  | — |  |  | $ | — |
__________ (a) Stock options exercised during the nine months ended September 30, 2018 had an aggregate intrinsic value of $8 million and the cash received was $2 million.

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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