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Earnings Per Share (Tables)
 3 Months Ended
Jul. 31, 2019
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)
2018
 
2019
Net income available to common stockholders
$
200

 
$
186

 
 
 
 
Share data (in thousands):
 
 
 
Basic average common shares outstanding
480,964

 
477,369

Dilutive effect of stock-based awards
3,477

 
2,719

Diluted average common shares outstanding
484,441

 
480,088

 
 
 
 
Basic earnings per share
$
0.42

 
$
0.39

Diluted earnings per share
$
0.41

 
$
0.39