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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Based Compensation Activity | The activity related to the Company’s restricted stock units (“RSUs”) consisted of (in thousands of shares):
|  | Time-Based RSUs |  | Performance-Based and Market-Based RSUs
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017 (a) | 878 |  |  | $ | 34.83 |  |  | 923 |  |  | $ | 34.11 |
| Granted | 915 |  |  | 35.32 |  |  | 572 |  |  | 35.21 |
| Vested (b) | (470 | ) |  | 37.11 |  |  | (146 | ) |  | 36.55 |
| Forfeited/expired | (92 | ) |  | 32.53 |  |  | (304 | ) |  | 38.73 |
Outstanding at September 30, 2017 (c) | 1,231 |  |  | $ | 34.50 |  |  | 1,045 |  |  | $ | 33.03 |
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(a) | Reflects the maximum number of stock units assuming achievement of all time-, performance- and market-vesting criteria and does not include those for non-employee directors. The weighted-average fair value of time-based RSUs, and performance-based and market-based RSUs granted during the nine months ended September 30, 2016 was $25.92 and $23.33, respectively.
(b) | The total grant date fair value of RSUs vested during the nine months ended September 30, 2017 and 2016 was $23 million and $27 million, respectively.
(c) | The Company assumes 0.1 million of performance-based and market-based RSUs outstanding awards will vest over time with weighted average grate date fair value of $36.64. The Company’s outstanding time-based RSUs, and performance-based and market-based RSUs expected to vest had aggregate intrinsic values of $47 million and $4 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs, and performance-based and market-based RSUs amounted to $40 million and will be recognized over a weighted average vesting period of 1.3 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 |  | Aggregate Intrinsic Value (in millions) |  | Weighted Average Remaining Contractual Term (years)
Outstanding at January 1, 2017 | 810 |  |  | $ | 2.91 |  |  | $ | 27 |  |  | 2.3
| Granted | — |  |  | — |  |  | — |  |  |
| Exercised | (14 | ) |  | 0.79 |  |  | — |  |  |
| Forfeited/expired | — |  |  | — |  |  | — |  |  |
Outstanding and exercisable at September 30, 2017 | 796 |  |  | $ | 2.95 |  |  | $ | 28 |  |  | 1.5

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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