($ in millions except per share amounts)

For the year ended December 31:

2020

2019

2018

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

Basic

890,348,679

887,235,105

912,048,072

Add—incremental shares under stock-based compensation plans

4,802,940

4,199,440

2,786,316

Add—incremental shares associated with contingently issuable shares

1,412,352

1,378,831

1,481,326

Assuming dilution

896,563,971

892,813,376

916,315,714

Income from continuing operations

$

5,501

$

9,435

$

8,723

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

89

(4)

5

Net income on which basic earnings per share is calculated

$

5,590

$

9,431

$

8,728

Income from continuing operations

$

5,501

$

9,435

$

8,723

Net income applicable to contingently issuable shares

(2)

0

(6)

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

$

5,499

$

9,435

$

8,718

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

89

(4)

5

Net income on which diluted earnings per share is calculated

$

5,588

$

9,431

$

8,722

Earnings/(loss) per share of common stock

Assuming dilution

Continuing operations

$

6.13

$

10.57

$

9.51

Discontinued operations

0.10

(0.01)

0.01

Total

$

6.23

$

10.56

$

9.52

Basic

Continuing operations

$

6.18

$

10.63

$

9.56

Discontinued operations

0.10

0.00

0.01

Total

$

6.28

$

10.63

$

9.57