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Earnings per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30,
 
Six months ended June 30,
($ in millions, except per share data; shares in thousands) (a)
 
2017
 
2016
 
2017
 
2016
Net income from continuing operations
 
$
254

 
$
357

 
$
467

 
$
604

Preferred stock dividends
 
—

 
(15
)
 
—

 
(30
)
Net income from continuing operations attributable to common shareholders
 
254

 
342

 
467

 
574

(Loss) income from discontinued operations, net of tax
 
(2
)
 
3

 
(1
)
 
6

Net income attributable to common shareholders
 
$
252

 
$
345

 
$
466

 
$
580

Basic weighted-average common shares outstanding (b)
 
457,891

 
485,370

 
461,904

 
484,802

Diluted weighted-average common shares outstanding (b)
 
458,819

 
486,074

 
462,802

 
485,364

Basic earnings per common share
 
 
 
 
 
 
 
 
Net income from continuing operations
 
$
0.55

 
$
0.70

 
$
1.01

 
$
1.18

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

 
—

 
0.01

Net income
 
$
0.55

 
$
0.71

 
$
1.01

 
$
1.20

Diluted earnings per common share
 
 
 
 
 
 
 
 
Net income from continuing operations
 
$
0.55

 
$
0.70

 
$
1.01

 
$
1.18

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

 
—

 
0.01

Net income
 
$
0.55

 
$
0.71

 
$
1.01

 
$
1.19

(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 six months ended June 30, 2017, and 2016.