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Earnings per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings per share Earnings per share

The following table provides a reconciliation between basic and diluted earnings per share:
In millions, except per share data
Year ended December 31,
2019

 
2018

 
2017

Net income
$
4,216

 
$
4,328

 
$
5,484

Weighted-average basic shares outstanding
720.1

 
734.5

 
753.6

Dilutive effect of stock-based compensation
2.5

 
3.2

 
3.7

Weighted-average diluted shares outstanding
722.6

 
737.7

 
757.3

Basic earnings per share
$
5.85

 
$
5.89

 
$
7.28

Diluted earnings per share
$
5.83

 
$
5.87

 
$
7.24

Units excluded from the calculation as their inclusion would not have a dilutive effect
 
 
 
 
 
Stock options
0.5

 
0.6

 
0.4

Performance share units
0.2

 
0.3

 
0.1