Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Sales	$ 4,306	$ 4,276	$ 4,201
Excise taxes	943	952	953
Net sales	3,363	3,324	3,248
Cost of sales	1,236	1,158	1,046
Gross profit	2,127	2,166	2,202
Advertising expenses	383	396	405
Selling, general, and administrative expenses	642	641	765
Other expense (income), net	11	(15)	(16)
Operating income	1,091	1,144	1,048
Non-operating postretirement expense	5	22	9
Interest income	(5)	(8)	(6)
Interest expense	82	88	68
Income before income taxes	1,009	1,042	977
Income taxes	182	207	260
Net income	$ 827	$ 835	$ 717
Earnings per share:
Basic (dollars per share)	$ 1.73	$ 1.74	$ 1.49
Diluted (dollars per share)	$ 1.72	$ 1.73	$ 1.48