Millions, Except Per Share Amounts, for the Three Months Ended March 31,

2023

2022

Net income

$

1,630

$

1,630

Weighted-average number of shares outstanding:

Basic

610.6

632.2

Dilutive effect of stock options

0.4

0.7

Dilutive effect of retention shares and units

0.5

0.7

Diluted

611.5

633.6

Earnings per share – basic

$

2.67

$

2.58

Earnings per share – diluted

$

2.67

$

2.57

Stock options excluded as their inclusion would be anti-dilutive

0.8

0.1