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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Share-Based Compensation | Share-Based Compensation The Company recognized $15 million and $34 million of share-based compensation expense during the three and six months ended June 30, 2019, respectively, and $17 million and $36 million of share-based compensation expense during the three and six months ended June 30, 2018, respectively. The Company’s annual grant of share-based awards generally occurs in the first quarter. During the six months ended June 30, 2019 and 2018, stock options to purchase 1.7 million and 1.9 million shares, respectively, were exercised. A summary of stock option, restricted stock unit and performance share unit grant activity is as follows:
| Six Months Ended June 30,
| 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 |  |  | 1,265 |  |  | $ | 22.43 |
Restricted stock units | 371 |  |  | 84.84 |  |  | 501 |  |  | 70.14 |
Performance share units | — |  |  | — |  |  | 165 |  |  | 75.39 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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