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Income Taxes (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2011	Apr. 30, 2010
Income Tax Disclosure [Abstract]
Adjustment to reverse of income tax expense that was incorrectly recognized in prior periods	$ 8
Gross unrecognized tax benefits	13	11	40	35
Reduction in effective income tax rate if recognized		7
Total gross interest and penalties	3	2	11
Estimated increase in unrecognized tax benefits in next 12 months as a result of net tax positions taken		$ 1

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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