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Earnings per Common Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the calculation of basic and diluted earnings per common share.
 
 
Three months ended June 30,
 
Six months ended June 30,
($ in millions, except per share data; shares in thousands) (a)
 
2020
 
2019
 
2020
 
2019
Net income (loss) from continuing operations
 
$
242

 
$
584

 
$
(77
)
 
$
959

Loss from discontinued operations, net of tax
 
(1
)
 
(2
)
 
(1
)
 
(3
)
Net income (loss) attributable to common stockholders
 
$
241

 
$
582

 
$
(78
)
 
$
956

Basic weighted-average common shares outstanding (b)
 
375,051

 
398,100

 
375,387

 
401,098

Diluted weighted-average common shares outstanding (b) (c)
 
375,762

 
399,916

 
375,387

 
402,921

Basic earnings per common share
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
0.65

 
$
1.47

 
$
(0.20
)
 
$
2.39

Loss from discontinued operations, net of tax
 
—

 
—

 
—

 
(0.01
)
Net income (loss)
 
$
0.64

 
$
1.46

 
(0.21
)
 
2.39

Diluted earnings per common share
 
 
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
0.64

 
$
1.46

 
(0.20
)
 
2.38

Loss from discontinued operations, net of tax
 
—

 
—

 
—

 
(0.01
)
Net income (loss)
 
$
0.64

 
$
1.46

 
$
(0.21
)
 
$
2.37

(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.
(c)
Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share. During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million, respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2019.