($ in millions except per share amounts)

​

​

​

​

​

​

For the year ended December 31:

2019

2018

2017

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

​

​

​

​

​

​

​

​

​

Basic

​

​

887,235,105

​

​

912,048,072

​

​

932,828,295

Add—incremental shares under stock-based compensation plans

​

​

4,199,440

​

​

2,786,316

​

​

3,094,373

Add—incremental shares associated with contingently issuable shares

​

​

1,378,831

​

​

1,481,326

​

​

1,462,957

Assuming dilution

​

​

892,813,376

​

​

916,315,714

​

​

937,385,625

Income from continuing operations

​

$

9,435

​

$

8,723

​

$

5,758

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

​

​

(4)

​

​

5

​

​

(5)

Net income on which basic earnings per share is calculated

​

$

9,431

​

$

8,728

​

$

5,753

Income from continuing operations

​

$

9,435

​

$

8,723

​

$

5,758

Net income applicable to contingently issuable shares

​

​

0

​

​

(6)

​

​

(2)

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

​

$

9,435

​

$

8,718

​

$

5,756

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

​

​

(4)

​

​

5

​

​

(5)

Net income on which diluted earnings per share is calculated

​

$

9,431

​

$

8,722

​

$

5,752

Earnings/(loss) per share of common stock

​

​

​

​

​

​

​

​

​

Assuming dilution

​

​

​

​

​

​

​

​

​

Continuing operations

​

$

10.57

​

$

9.51

​

$

6.14

Discontinued operations

​

​

(0.01)

​

​

0.01

​

​

0.00

Total

​

$

10.56

​

$

9.52

​

$

6.14

Basic

​

​

​

​

​

​

​

​

​

Continuing operations

​

$

10.63

​

$

9.56

​

$

6.17

Discontinued operations

​

​

0.00

​

​

0.01

​

​

0.00

Total

​

$

10.63

​

$

9.57

​

$

6.17