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Debt and Credit Facilities (Tables)
 12 Months Ended
Apr. 30, 2014
Debt Disclosure [Abstract]  
Schedule of long-term debt
Our long-term debt (net of unamortized discount) consisted of:
April 30,
2013
 
2014
2.50% senior notes, due in fiscal 2016
$
249

 
$
249

1.00% senior notes, due in fiscal 2018
249

 
249

2.25% senior notes, due in fiscal 2023
249

 
249

3.75% senior notes, due in fiscal 2043
250

 
250

Other
2

 
—

 
999

 
997

Less current portion
2

 
—

 
$
997

 
$
997