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Earnings Per Share (Tables)
 3 Months Ended
Jul. 31, 2014
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)
2013
 
2014
Net income available to common stockholders
$
143

 
$
150

Share data (in thousands):
 
 
 
Basic average common shares outstanding
213,709

 
213,444

Dilutive effect of stock-based awards
1,611

 
1,575

Diluted average common shares outstanding
215,320

 
215,019

 
 
 
 
Basic earnings per share
$
0.67

 
$
0.70

Diluted earnings per share
$
0.66

 
$
0.70