Balance Sheet Information (Details) - USD ($) $ in Millions	Apr. 30, 2018	Apr. 30, 2017
Other current assets:
Prepaid taxes	$ 196	$ 210
Other	102	132
Other current assets	298	342
Property, plant, and equipment:
Land	82	81
Buildings	568	497
Equipment	725	659
Construction in process	61	96
Property, plant and equipment, gross	1,436	1,333
Less accumulated depreciation	656	620
Property, plant, and equipment, net	780	713
Accounts payable and accrued expenses:
Accounts payable, trade	154	137
Accrued expenses:
Advertising and promotion	136	111
Compensation and commissions	99	97
Excise and other non-income taxes	77	61
Other	115	95
Accrued expenses	427	364
Accounts payable and accrued expenses	$ 581	$ 501