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Earnings Per Share (Tables)
 6 Months Ended
Oct. 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
 
Six Months Ended
 
October 31,
 
October 31,
(Dollars in millions, except per share amounts)
2018
 
2019
 
2018
 
2019
Net income available to common stockholders
$
249

 
$
282

 
$
449

 
$
468

 
 
 
 
 
 
 
 
Share data (in thousands):
 
 
 
 
 
 
 
Basic average common shares outstanding
480,436

 
477,680

 
480,647

 
477,522

Dilutive effect of stock-based awards
3,155

 
2,801

 
3,316

 
2,760

Diluted average common shares outstanding
483,591

 
480,481

 
483,963

 
480,282

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.52

 
$
0.59

 
$
0.93

 
$
0.98

Diluted earnings per share
$
0.52

 
$
0.59

 
$
0.93

 
$
0.97