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Earnings per Common Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share Earnings per Common Share
The following table presents the calculation of basic and diluted earnings per common share.
Year ended December 31, ($ in millions, except per share data; shares in thousands) (a)
2019
 
2018
 
2017
Net income from continuing operations
$
1,721

 
$
1,263

 
$
926

(Loss) income from discontinued operations, net of tax
(6
)
 
—

 
3

Net income attributable to common stockholders
$
1,715

 
$
1,263

 
$
929

Basic weighted-average common shares outstanding (b)
393,234

 
425,165

 
453,704

Diluted weighted-average common shares outstanding (b)
395,395

 
427,680

 
455,350

Basic earnings per common share
 
 
 
 
 
Net income from continuing operations
$
4.38

 
$
2.97

 
$
2.04

(Loss) income from discontinued operations, net of tax
(0.02
)
 
—

 
0.01

Net income
4.36

 
2.97

 
2.05

Diluted earnings per common share
 
 
 
 
 
Net income from continuing operations
4.35

 
2.95

 
2.03

(Loss) income from discontinued operations, net of tax
(0.02
)
 
—

 
0.01

Net income
$
4.34

 
$
2.95

 
$
2.04

(a)
Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
(b)
Includes shares related to share-based compensation that vested but were not yet issued.