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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table shows how we computed basic and diluted earnings per common share for the three and nine months ended September 30, 2020 and 2019 (dollars and share data in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2020
 
2019
 
2020
 
2019
Net (loss) income
$
(393
)
 
$
187

 
$
(981
)
 
$
408

 
 
 
 
 
 
 
 
Weighted average basic shares
272.4

 
294.0

 
274.3

 
300.1

Effect of dilutive securities
—

 
1.9

 
—

 
1.7

Weighted average diluted shares
272.4

 
295.9

 
274.3

 
301.8

 
 
 
 
 
 
 
 
(Loss) earnings per common share
 
 
 
 
 
 
 
Basic
$
(1.44
)
 
$
0.63

 
$
(3.58
)
 
$
1.36

Diluted
$
(1.44
)
 
$
0.63

 
$
(3.58
)
 
$
1.35