Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Other current assets:
Prepaid taxes	$ 123	$ 120
Other	90	68
Other current assets	213	188
Property, plant, and equipment:
Land	70	70
Buildings	351	330
Equipment	487	454
Construction in process	48	21
Property, plant and equipment, gross	956	875
Less accumulated depreciation	506	476
Property, plant, and equipment, net	450	399
Accounts payable and accrued expenses:
Accounts payable, trade	133	120
Accrued expenses:
Advertising and promotion	85	64
Compensation and commissions	106	87
Excise and other non-income taxes	65	58
Self-insurance losses	11	10
Postretirement benefits	6	6
Interest	9	5
Other	36	36
Accrued expenses	318	266
Accounts payable and accrued expenses	$ 451	$ 386