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Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 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.
Year ended December 31, ($ in millions, except per share data; shares in thousands) (a)
 
2017
 
2016
 
2015
Net income from continuing operations
 
$
926

 
$
1,111

 
$
897

Preferred stock dividends (b)
 
—

 
(30
)
 
(2,571
)
Net income (loss) from continuing operations attributable to common stockholders
 
926

 
1,081

 
(1,674
)
Income (loss) from discontinued operations, net of tax
 
3

 
(44
)
 
392

Net income (loss) attributable to common stockholders
 
$
929

 
$
1,037

 
$
(1,282
)
Basic weighted-average common shares outstanding (c)
 
453,704

 
481,105

 
482,873

Diluted weighted-average common shares outstanding (c) (d)
 
455,350

 
482,182

 
482,873

Basic earnings per common share
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
2.04

 
$
2.25

 
$
(3.47
)
Income (loss) from discontinued operations, net of tax
 
0.01

 
(0.09
)
 
0.81

Net income (loss)
 
$
2.05

 
$
2.15

 
$
(2.66
)
Diluted earnings per common share
 
 
 
 
 
 
Net income (loss) from continuing operations
 
$
2.03

 
$
2.24

 
$
(3.47
)
Income (loss) from discontinued operations, net of tax
 
0.01

 
(0.09
)
 
0.81

Net income (loss)
 
$
2.04

 
$
2.15

 
$
(2.66
)
(a)
Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
(b)
Preferred stock dividends for the year ended December 31, 2015, include $2,364 million recognized in connection with the partial redemption of the Series G Preferred Stock and the repurchase of the Series A Preferred Stock. These dividends represent an additional return to preferred stockholders calculated as the excess consideration paid over the carrying amount derecognized.
(c)
Includes shares related to share-based compensation that vested but were not yet issued for the years ended December 31, 2017, 2016, and 2015.
(d)
Due to the antidilutive effect of the net loss from continuing operations attributable to common stockholders for the year ended December 31, 2015, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share.