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Short-Term Borrowings (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Apr. 30, 2014
Short-term Debt [Abstract]
Commercial Paper	$ 119	$ 0
Commercial Paper Borrowings, Average Remaining Maturity	6 days
Commercial Paper Borrowings, Weighted Average Interest Rate	0.15%

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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