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Earnings per Common Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
($ in millions, except per share data; shares in thousands) (a)
2020
 
2019
Net (loss) income from continuing operations
$
(319
)
 
$
375

Loss from discontinued operations, net of tax
—

 
(1
)
Net (loss) income attributable to common stockholders
$
(319
)
 
$
374

Basic weighted-average common shares outstanding (b)
375,723

 
404,129

Diluted weighted-average common shares outstanding (b) (c)
375,723

 
405,959

Basic earnings per common share
 
 
 
Net (loss) income from continuing operations
$
(0.85
)
 
$
0.93

Net (loss) income
(0.85
)
 
0.93

Diluted earnings per common share
 
 
 
Net (loss) income from continuing operations
(0.85
)
 
0.92

Net (loss) income
$
(0.85
)
 
$
0.92

(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 three months ended March 31, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share. During the three months ended March 31, 2020, there were 1.8 million in share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months ended March 31, 2019.