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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the calculation of basic and diluted earnings per common share.
 
 
Three months ended March 31,
($ in millions, except share data) (a)
 
2016
 
2015
Net income from continuing operations
 
$
247

 
$
179

Preferred stock dividends
 
(15
)
 
(67
)
Net income from continuing operations attributable to common shareholders
 
232

 
112

Income from discontinued operations, net of tax
 
3

 
397

Net income attributable to common shareholders
 
$
235

 
$
509

Basic weighted-average common shares outstanding (b)
 
484,233,246

 
482,247,935

Diluted weighted-average common shares outstanding (b)
 
484,654,229

 
482,781,619

Basic earnings per common share
 


 
 
Net income from continuing operations
 
$
0.48

 
$
0.23

Income from discontinued operations, net of tax
 
0.01

 
0.82

Net income
 
$
0.49

 
$
1.06

Diluted earnings per common share
 


 
 
Net income from continuing operations
 
$
0.48

 
$
0.23

Income from discontinued operations, net of tax
 
0.01

 
0.82

Net income
 
$
0.49

 
$
1.06

(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, 2016, and 2015, respectively.