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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Stock-Based Compensation |
Stock-Based Compensation | Note 7 – Stock-Based Compensation A summary of stock-based compensation for each of the respective periods is as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
In millions |  | 2018 |  | 2017 |  | 2018 |  | 2017
Stock-based compensation: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 11 |  | $ | 14 |  | $ | 25 |  | $ | 34
Restricted stock units and performance share units |  |  | 43 |  |  | 39 |  |  | 85 |  |  | 74
Total stock-based compensation |  | $ | 54 |  | $ | 53 |  | $ | 110 |  | $ | 108

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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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