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Earnings Per Share (Tables)
 6 Months Ended
Oct. 31, 2016
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)
2015
 
2016
 
2015
 
2016
Net income available to common stockholders
$
200

 
$
197

 
$
356

 
$
342

Share data (in thousands):
 
 
 
 
 
 
 
Basic average common shares outstanding
408,110

 
389,050

 
411,116

 
390,994

Dilutive effect of stock-based awards
2,751

 
2,798

 
2,750

 
2,895

Diluted average common shares outstanding
410,861

 
391,848

 
413,866

 
393,889

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.49

 
$
0.51

 
$
0.87

 
$
0.87

Diluted earnings per share
$
0.49

 
$
0.50

 
$
0.86

 
$
0.87