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Earnings Per Share (Tables)
 9 Months Ended
Jan. 31, 2017
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
 
Nine Months Ended
 
January 31,
 
January 31,
(Dollars in millions, except per share amounts)
2016
 
2017
 
2016
 
2017
Net income available to common stockholders
$
190

 
$
182

 
$
545

 
$
524

Share data (in thousands):
 
 
 
 
 
 
 
Basic average common shares outstanding
402,365

 
384,520

 
408,483

 
388,884

Dilutive effect of stock-based awards
2,416

 
2,646

 
2,668

 
2,812

Diluted average common shares outstanding
404,781

 
387,166

 
411,151

 
391,696

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.47

 
$
0.47

 
$
1.33

 
$
1.35

Diluted earnings per share
$
0.47

 
$
0.47

 
$
1.33

 
$
1.34