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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Stock based compensation expense | Charged to general and administrative expenses, total share-based compensation expense was as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (In millions)
| Pretax Charges |  | Net-of-Tax Amount |  | Pretax Charges |  | Net-of-Tax Amount |  | Pretax Charges |  | Net-of-Tax Amount
Restricted stock and performance awards | $ | 20 |  |  | $ | 17 |  |  | $ | 19 |  |  | $ | 13 |  |  | $ | 19 |  |  | $ | 12 |
Employee stock purchase plan and stock options | 6 |  |  | 5 |  |  | 4 |  |  | 3 |  |  | 3 |  |  | 2 |
| $ | 26 |  |  | $ | 22 |  |  | $ | 23 |  |  | $ | 16 |  |  | $ | 22 |  |  | $ | 14 |
Restricted and performance stock activity | Restricted stock. Restricted and performance stock activity for the year ended December 31, 2016 is summarized below:
| Restricted Shares |  | Performance Shares |  | Total Shares |  | Weighted Average Grant Date Fair Value
Unvested balance as of December 31, 2015 | 658,156 |  |  | 376,601 |  |  | 1,034,757 |  |  | $ | 46.68 |
Granted | 300,007 |  |  | 226,010 |  |  | 526,017 |  |  | 63.84 |
Vested | (352,292 | ) |  | — |  |  | (352,292 | ) |  | 42.06 |
Canceled | — |  |  | (256,955 | ) |  | (256,955 | ) |  | 46.24 |
Forfeited | (28,627 | ) |  | — |  |  | (28,627 | ) |  | 53.06 |
Unvested balance as of December 31, 2016 | 577,244 |  |  | 345,656 |  |  | 922,900 |  |  | $ | 58.15 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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=6415400&loc=d3e5070-113901 + Details
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