Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Sales	$ 1,272	$ 1,248	$ 2,259	$ 2,226
Excise taxes	287	259	521	471
Net sales	985	989	1,738	1,755
Cost of sales	404	370	692	638
Gross profit	581	619	1,046	1,117
Advertising expenses	95	112	157	204
Selling, general, and administrative expenses	155	158	303	322
Gain on sale of business	0	0	(127)	0
Other expense (income), net	1	(3)	(4)	(9)
Operating income	330	352	717	600
Non-operating postretirement expense	2	1	3	2
Interest income	(1)	(1)	(1)	(3)
Interest expense	20	21	40	42
Income before income taxes	309	331	675	559
Income taxes	69	49	111	91
Net income	$ 240	$ 282	$ 564	$ 468
Earnings per share:
Basic (dollars per share)	$ 0.50	$ 0.59	$ 1.18	$ 0.98
Diluted (dollars per share)	$ 0.50	$ 0.59	$ 1.17	$ 0.97