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Earnings (Loss) Per Common Share (Tables)
6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings (Loss) Per Common Share [Table Text Block]
 
Three Months Ended 
June 30,
 
Six Months Ended 
June 30,
 
2020
 
2019
 
2020
 
2019
 
(Dollars in millions, except per-share
amounts; shares in thousands)
Net income (loss) available to common stockholders
$
303

 
$
310

 
$
(215
)
 
$
504

Basic weighted-average shares
1,213,601

 
1,212,045

 
1,213,310

 
1,211,769

Effect of dilutive securities:
 
 
 
 
 
 
 
Nonvested restricted stock units
980

 
1,792

 

 
1,818

Stock options

 
228

 

 
243

Diluted weighted-average shares (1)
1,214,581

 
1,214,065

 
1,213,310

 
1,213,830

Earnings (loss) per common share:
 
 
 
 
 
 
 
Basic
$
.25

 
$
.26

 
$
(.18
)
 
$
.42

Diluted
$
.25

 
$
.26

 
$
(.18
)
 
$
.41

__________
(1)
For the six months ended June 30, 2020, 1.1 million weighted-average nonvested restricted stock units have been excluded from the computation of diluted earnings (loss) per common share as their inclusion would be antidilutive due to our loss available to common stockholders.