Balance Sheet Information (Details) - USD ($) $ in Millions	Apr. 30, 2017	Apr. 30, 2016
Other current assets:
Prepaid taxes	$ 210	$ 208
Other	132	149
Other current assets	342	357
Property, plant, and equipment:
Land	81	76
Buildings	497	468
Equipment	659	619
Construction in process	96	54
Property, plant and equipment, gross	1,333	1,217
Less accumulated depreciation	620	588
Property, plant, and equipment, net	713	629
Accounts payable and accrued expenses:
Accounts payable, trade	137	121
Accrued expenses:
Advertising and promotion	111	133
Compensation and commissions	97	105
Excise and other non-income taxes	61	58
Other	95	84
Accrued expenses	364	380
Accounts payable and accrued expenses	501	501
Other liabilities:
Deferred benefit – tax (Note 13)	43	59
Other	87	87
Other liabilities	$ 130	$ 146