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Earnings per Common Share
 9 Months Ended
Sep. 30, 2017
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 September 30,
 
Nine months ended September 30,
($ in millions, except per share data; shares in thousands) (a)
 
2017
 
2016
 
2017
 
2016
Net income from continuing operations
 
$
280

 
$
261

 
$
747

 
$
865

Preferred stock dividends
 
—

 
—

 
—

 
(30
)
Net income from continuing operations attributable to common shareholders
 
280

 
261

 
747

 
835

Income (loss) from discontinued operations, net of tax
 
2

 
(52
)
 
1

 
(46
)
Net income attributable to common shareholders
 
$
282

 
$
209

 
$
748

 
$
789

Basic weighted-average common shares outstanding (b)
 
449,169

 
482,393

 
457,612

 
483,993

Diluted weighted-average common shares outstanding (b)
 
451,078

 
483,575

 
458,848

 
484,762

Basic earnings per common share
 
 
 
 
 
 
 
 
Net income from continuing operations
 
$
0.62

 
$
0.54

 
$
1.63

 
$
1.73

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

 
(0.11
)
 
—

 
(0.10
)
Net income
 
$
0.63

 
$
0.43

 
$
1.63

 
$
1.63

Diluted earnings per common share
 
 
 
 
 
 
 
 
Net income from continuing operations
 
$
0.62

 
$
0.54

 
$
1.63

 
$
1.72

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

 
(0.11
)
 
—

 
(0.10
)
Net income
 
$
0.63

 
$
0.43

 
$
1.63

 
$
1.63

(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 and nine months ended September 30, 2017, and 2016.