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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Share-based Compensation [Abstract] |
Summary Of Changes In Stock Options | The following table summarizes the changes in the number of shares of common stock underlying outstanding stock options for the three months ended March 31, 2016 (in millions, except weighted-average exercise prices):
| Options Outstanding and Exercisable |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value Exercisable
Outstanding at December 31, 2015 | 1.2 |  |  | $ | 20 |  |  | $ | 28.1 |
Exercised | (0.2 | ) |  | 17 |  |  |
Outstanding at March 31, 2016 | 1.0 |  |  | $ | 21 |  |  | $ | 22.0 |
Summary Of Changes in Restricted Stock And Restricted Stock Units | The following table summarizes the changes in the number of outstanding restricted stock units for the three months ended March 31, 2016 (shares in millions):
| Restricted Stock Units |  | Weighted- Average Grant Date Fair Value
Outstanding at December 31, 2015 | 2.9 |  |  | $ | 34 |
Vested | (0.9 | ) |  | 26 |
Outstanding at March 31, 2016 | 2.0 |  |  | $ | 37 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- References No definition available. + Details
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