($ in millions except per share amounts)

​

​

​

​

​

​

​

​

​

For the year ended December 31:

2021

2020

2019

Weighted-average number of shares on which earnings per share calculations are based

​

​

​

​

Basic

895,990,771

​

890,348,679

887,235,105

Add—incremental shares under stock-based compensation plans

6,883,290

​

4,802,940

4,199,440

Add—incremental shares associated with contingently issuable shares

1,766,940

​

1,412,352

1,378,831

Assuming dilution

904,641,001

​

896,563,971

892,813,376

Income from continuing operations

​

$

4,712

​

$

3,932

​

$

7,146

Income/(loss) from discontinued operations, net of tax

​

1,030

​

1,658

​

2,285

Net income on which basic earnings per share is calculated

​

$

5,743

​

$

5,590

​

$

9,431

Income from continuing operations

​

$

4,712

​

$

3,932

​

$

7,146

Net income applicable to contingently issuable shares

​

—

​

(2)

​

0

Income from continuing operations on which diluted earnings per share is calculated

​

$

4,712

​

$

3,930

​

$

7,146

Income/(loss) from discontinued operations, net of tax, on which basic and diluted earnings per share is calculated

​

1,030

​

1,658

​

2,285

Net income on which diluted earnings per share is calculated

​

$

5,743

​

$

5,588

​

$

9,431

Earnings/(loss) per share of common stock

​

​

​

​

​

​

Assuming dilution

​

​

​

​

​

​

Continuing operations

​

$

5.21

​

$

4.38

​

$

8.00

Discontinued operations

​

1.14

​

1.85

​

2.56

Total

​

$

6.35

​

$

6.23

​

$

10.56

Basic

​

​

​

​

​

​

Continuing operations

​

$

5.26

​

$

4.42

​

$

8.05

Discontinued operations

​

1.15

​

1.86

​

2.58

Total

​

$

6.41

​

$

6.28

​

$

10.63

​

​

​

​

​

​

​

​

​

​