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Earnings Per Share
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share 8. Earnings Per Share

The following table provides a reconciliation between basic and diluted earnings per share:

Three Months Ended

Nine Months Ended

September 30,

September 30,

Millions, Except Per Share Amounts

2020 

2019 

2020 

2019 

Net income

$

1,363 

$

1,555 

$

3,969 

$

4,516 

Weighted-average number of shares outstanding:

Basic

675.0 

699.3 

679.0 

707.2 

Dilutive effect of stock options

0.9 

1.2 

0.8 

1.3 

Dilutive effect of retention shares and units

0.9 

1.4 

0.9 

1.3 

Diluted

676.8 

701.9 

680.7 

709.8 

Earnings per share – basic

$

2.02 

$

2.22 

$

5.85 

$

6.39 

Earnings per share – diluted

$

2.01 

$

2.22 

$

5.83 

$

6.36 

Stock options excluded as their inclusion would be anti-dilutive

0.5 

0.6 

0.7 

0.5