XML 40 R30.htm IDEA: XBRL DOCUMENT v3.21.1
Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share The following table provides a reconciliation between basic and diluted earnings per share:

Millions, Except Per Share Amounts,

for the Three Months Ended March 31,

2021

2020 

Net income

$

1,341 

$

1,474 

Weighted-average number of shares outstanding:

Basic

667.6 

684.3 

Dilutive effect of stock options

0.8 

0.9 

Dilutive effect of retention shares and units

0.8 

1.0 

Diluted

669.2 

686.2 

Earnings per share – basic

$

2.01 

$

2.15 

Earnings per share – diluted

$

2.00 

$

2.15 

Stock options excluded as their inclusion would be anti-dilutive

0.3 

0.7