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Earnings Per Share (Tables)
 3 Months Ended
Jul. 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
 
July 31,
(Dollars in millions, except per share amounts)
2015
 
2016
Net income available to common stockholders
$
156

 
$
144

Share data (in thousands):
 
 
 
Basic average common shares outstanding
414,526

 
393,018

Dilutive effect of stock-based awards
2,750

 
2,991

Diluted average common shares outstanding
417,276

 
396,009

 
 
 
 
Basic earnings per share
$
0.38

 
$
0.37

Diluted earnings per share
$
0.37

 
$
0.36