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Net Income Per Share
 3 Months Ended
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,
 20212020
Numerator for Basic and Diluted Earnings Per Share -
Net Income$677 $10 
Denominator for Basic Earnings Per Share -  
Weighted Average Shares580 578 
Potential Dilutive Common Shares -  
Stock Options/SARs/ESPP1 — 
Restricted Stock/Units and Performance Units2 2 
Denominator for Diluted Earnings Per Share -  
Adjusted Diluted Weighted Average Shares583 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.