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Earnings Per Share (Tables)
 6 Months Ended
Oct. 31, 2018
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)
2017
 
2018
 
2017
 
2018
Net income available to common stockholders
$
239

 
$
249

 
$
417

 
$
449

 
 
 
 
 
 
 
 
Share data (in thousands):
 
 
 
 
 
 
 
Basic average common shares outstanding
480,150

 
480,436

 
480,095

 
480,647

Dilutive effect of stock-based awards
3,134

 
3,155

 
3,035

 
3,316

Diluted average common shares outstanding
483,284

 
483,591

 
483,130

 
483,963

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.50

 
$
0.52

 
$
0.87

 
$
0.93

Diluted earnings per share
$
0.49

 
$
0.52

 
$
0.86

 
$
0.93