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

2022

2021

Net income

$

1,630

$

1,341

Weighted-average number of shares outstanding:

Basic

632.2

667.6

Dilutive effect of stock options

0.7

0.8

Dilutive effect of retention shares and units

0.7

0.8

Diluted

633.6

669.2

Earnings per share – basic

$

2.58

$

2.01

Earnings per share – diluted

$

2.57

$

2.00

Stock options excluded as their inclusion would be anti-dilutive

0.1

0.3