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Debt (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Long - term debt
Total long term debt	$ 506	$ 759
Current portion of long-term debt	3	255
Total Long term debt excluding current portion	503	504
5.2% notes, due in fiscal 2012 [Member]
Long - term debt
Total long term debt		252
5.0% notes due in fiscal 2014 [Member]
Long - term debt
Total long term debt	251	250
2.5% notes, due in fiscal 2016 [Member]
Long - term debt
Total long term debt	249	249
Other long-term debt [Member]
Long - term debt
Total long term debt	$ 6	$ 8

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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