Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Sales	$ 4,276	$ 4,201	$ 3,857
Excise taxes	952	953	863
Net sales	3,324	3,248	2,994
Cost of sales	1,158	1,046	973
Gross profit	2,166	2,202	2,021
Advertising expenses	396	405	372
Selling, general, and administrative expenses	641	765	657
Other expense (income), net	(15)	(16)	(18)
Operating income	1,144	1,048	1,010
Non-operating postretirement expense	22	9	21
Interest income	(8)	(6)	(3)
Interest expense	88	68	59
Income before income taxes	1,042	977	933
Income taxes	207	260	264
Net income	$ 835	$ 717	$ 669
Earnings per share:
Basic (dollars per share)	$ 1.74	$ 1.49	$ 1.38
Diluted (dollars per share)	$ 1.73	$ 1.48	$ 1.37