Sale of Hopland-Based Wine Business (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Other Income and Other Expense Disclosure [Line Items]
Sales of Hopland-based wine business	$ 0	$ 0	$ 234
Net income	591	513	572
Hopland Based Wine Business [Member]
Other Income and Other Expense Disclosure [Line Items]
Sales of Hopland-based wine business			234
Net income			$ 38