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Debt (Details) (USD $) In Millions	Apr. 30, 2011	Apr. 30, 2010
Long-term debt
Total long term debt	$ 759	$ 511
Current portion of long-term debt	255	3
Total long term debt excluding current portion	504	508
5.2% notes, due in fiscal 2012 [Member]
Long-term debt
Total long term debt	252	250
5.0% notes due in fiscal 2014 [Member]
Long-term debt
Total long term debt	250	250
2.5% notes, due in fiscal 2016 [Member]
Long-term debt
Total long term debt	249	0
other long-term debt [Member]
Long-term debt
Total long term debt	$ 8	$ 11

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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