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Earnings Per Share (Tables)
 3 Months Ended
Jul. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents information concerning basic and diluted earnings per share:
 
Three Months Ended
 
July 31,
(Dollars in millions, except per share amounts)
2019
 
2020
Net income available to common stockholders
$
186

 
$
324

 
 
 
 
Share data (in thousands):
 
 
 
Basic average common shares outstanding
477,369

 
478,327

Dilutive effect of stock-based awards
2,719

 
2,102

Diluted average common shares outstanding
480,088

 
480,429

 
 
 
 
Basic earnings per share
$
0.39

 
$
0.68

Diluted earnings per share
$
0.39

 
$
0.67