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Debt and Credit Facilities Short-term borrowings (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Short-term Debt [Abstract]
Short-term borrowings	$ 190us-gaap_ShortTermBorrowings	$ 8us-gaap_ShortTermBorrowings
Commercial Paper	$ 183us-gaap_CommercialPaper
Commercial Paper Borrowings, Weighted Average Interest Rate	0.17%
Commercial Paper Borrowings, Average Remaining Maturity	13 days

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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