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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation The Company recognized $19 million of share-based compensation expense in each of the three months ended March 31, 2019 and 2018. The Company’s annual grant of share-based awards generally occurs in the first quarter. During the three months ended March 31, 2019 and 2018, stock options to purchase 1.3 million and 1.6 million shares, respectively, were exercised. A summary of stock option, restricted stock unit and performance share unit grant activity is as follows:
| Three Months Ended March 31,
| 2019 |  | 2018
| Shares Granted (In thousands) |  | Weighted-Average Grant Date Fair Value |  | Shares Granted (In thousands) |  | Weighted-Average Grant Date Fair Value
Stock options | 1,171 |  |  | $ | 28.43 |  |  | 1,193 |  |  | $ | 22.40 |
Restricted stock units | 317 |  |  | 84.34 |  |  | 374 |  |  | 69.77 |
Performance share units | — |  |  | — |  |  | 165 |  |  | 75.39 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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