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Earnings per Common Share
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Earnings per Common Share
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)
 
2018
 
2017
Net income from continuing operations attributable to common stockholders
 
$
252

 
$
213

(Loss) income from discontinued operations, net of tax
 
(2
)
 
1

Net income attributable to common stockholders
 
$
250

 
$
214

Basic weighted-average common shares outstanding (b)
 
436,213

 
465,961

Diluted weighted-average common shares outstanding (b)
 
438,931

 
466,829

Basic earnings per common share
 
 
 
 
Net income from continuing operations
 
$
0.58

 
$
0.46

Loss from discontinued operations, net of tax
 
(0.01
)
 
—

Net income
 
$
0.57

 
$
0.46

Diluted earnings per common share
 
 
 
 
Net income from continuing operations
 
$
0.57

 
$
0.46

Loss from discontinued operations, net of tax
 
(0.01
)
 
—

Net income
 
$
0.57

 
$
0.46

(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 for the three months ended March 31, 2018, and 2017.