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Net Income Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The following table sets forth the computation of Net Income Per Share for the three-month periods ended March 31, 2021 and 2020 (in millions, except per share data):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Numerator for Basic and Diluted Earnings Per Share - |  |  |  |  |  |  |
Net Income | $ | 677 |  |  | $ | 10 |  |  |  |  |
Denominator for Basic Earnings Per Share - |  |  |  |  |  |  |
Weighted Average Shares | 580 |  |  | 578 |  |  |  |  |
Potential Dilutive Common Shares - |  |  |  |  |  |  |
Stock Options/SARs/ESPP | 1 |  |  | — |  |  |  |  |
Restricted Stock/Units and Performance Units | 2 |  |  | 2 |  |  |  |  |
Denominator for Diluted Earnings Per Share - |  |  |  |  |  |  |
Adjusted Diluted Weighted Average Shares | 583 |  |  | 580 |  |  |  |  |
Net Income Per Share |  |  |  |  |  |  |
Basic | $ | 1.17 |  |  | $ | 0.02 |  |  |  |  |
Diluted | $ | 1.16 |  |  | $ | 0.02 |  |  |  |  |
The diluted earnings per share calculation excludes stock option, SAR, and ESPP grants that were anti-dilutive. Shares underlying the excluded stock option, SAR and ESPP grants were 8 million and 9 million shares for the three months ended March 31, 2021 and 2020, respectively.

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