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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2020 and 2019 (dollars and share data in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Net (loss) income
$
(320
)
 
$
179

 
$
(588
)
 
$
221

 
 
 
 
 
 
 
 
Weighted average basic shares
271.7

 
300.3

 
275.1

 
303.1

Effect of dilutive securities
—

 
1.5

 
—

 
1.5

Weighted average diluted shares
271.7

 
301.8

 
275.1

 
304.6

 
 
 
 
 
 
 
 
(Loss) earnings per common share
 
 
 
 
 
 
 
Basic
$
(1.18
)
 
$
0.60

 
$
(2.14
)
 
$
0.73

Diluted
$
(1.18
)
 
$
0.59

 
$
(2.14
)
 
$
0.73