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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary Of Share Based Payment Other Than Options Valuation Assumptions |
| Nine Months Ended September 30,
| 2016 |  | 2015
Expected volatility of stock price | 46% |  | 37%
Risk-free interest rate | 0.98% |  | 0.74%
Valuation period | 3 years |  | 3 years
Dividend yield | 0.0% |  | 0.0%
Stock Based Compensation Activity | The activity related to the Company’s restricted stock units (“RSUs”) and cash units, consisted of (in thousands of shares):
|  | Time-Based RSUs |  | Performance-Based and Market-Based RSUs |  | Cash Unit Awards
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at January 1, 2016 (a) | 819 |  |  | $ | 43.34 |  |  | 941 |  |  | $ | 35.18 |  |  | 111 |  |  | $ | 18.04 |
| Granted | 587 |  |  | 25.92 |  |  | 528 |  |  | 23.33 |  |  | — |  |  | — |
| Vested (b) | (422 | ) |  | 36.06 |  |  | (488 | ) |  | 25.13 |  |  | (111 | ) |  | 18.04 |
| Forfeited/expired | (25 | ) |  | 38.34 |  |  | (51 | ) |  | 27.16 |  |  | — |  |  | — |
Outstanding at September 30, 2016 (c) | 959 |  |  | $ | 36.01 |  |  | 930 |  |  | $ | 34.14 |  |  | — |  |  | $ | — |
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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, 2015 was $54.72 and $55.51, respectively.
(b) | The total grant date fair value of RSUs vested during the nine months ended September 30, 2016 and 2015 was $27 million and $24 million, respectively. The total grant date fair value of cash units vested during the nine months ended September 30, 2016 and 2015 was $2 million, in each period.
(c) | The Company’s outstanding time-based RSUs and performance-based and market-based RSUs had aggregate intrinsic values of $33 million and $32 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $34 million and will be recognized over a weighted average vesting period of 1.3 years. The Company assumes that substantially all outstanding awards will vest over time.
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, 2016 | 827 |  |  | $ | 2.87 |  |  | $ | 28 |  |  | 3.3
| Granted | — |  |  | — |  |  |  |  |
| Exercised | (13 | ) |  | 0.79 |  |  | — |  |  |
| Forfeited/expired | — |  |  | — |  |  |  |  |
Outstanding and exercisable at September 30, 2016 | 814 |  |  | $ | 2.90 |  |  | $ | 25 |  |  | 2.5

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of market vesting restricted stock awards, including, but not limited to: (a) expected term of the award,(b) expected volatility of the entity's shares, (c) expected dividends and (d) risk-free rate. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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