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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Based Compensation Activity Related to Nonvested RSUs | The following table summarizes activity related to nonvested RSUs:
|  | Number of RSUs (In thousands) |  | Weighted Average Grant-Date Fair Value Per Share
Nonvested at December 31, 2014 |  | 2,326 |  |  | $ | 97.80 |
Granted |  | 595 |  |  | 192.47 |
Vested |  | (1,642 | ) |  | 103.30 |
Forfeited |  | (43 | ) |  | 132.28 |
Nonvested at December 31, 2015 |  | 1,236 |  |  | $ | 134.87 |
Granted |  | 679 |  |  | 206.69 |
Vested |  | (1,009 | ) |  | 137.62 |
Forfeited |  | (118 | ) |  | 203.65 |
Nonvested at December 31, 2016 |  | 788 |  |  | $ | 183.00 |
Granted |  | 519 |  |  | 254.58 |
Vested |  | (624 | ) |  | 201.65 |
Forfeited |  | (32 | ) |  | 223.23 |
Nonvested at December 31, 2017 |  | 651 |  |  | $ | 220.21 |
Stock Options | The following table pertains to stock options granted through 2012, in addition to stock options that vested and were exercised in 2017, 2016 and 2015 (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Grant-date fair value of all stock options that vested |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Intrinsic value of all stock options exercised |  | 139 |  |  | 172 |  |  | 265 |

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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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