Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Sales	$ 1,248	$ 1,161	$ 2,226	$ 2,148
Excise taxes	259	251	471	472
Net sales	989	910	1,755	1,676
Cost of sales	370	320	638	563
Gross profit	619	590	1,117	1,113
Advertising expenses	112	102	204	200
Selling, general, and administrative expenses	158	161	322	329
Other expense (income), net	(3)	(5)	(9)	(12)
Operating income	352	332	600	596
Non-operating postretirement expense	1	2	2	4
Interest income	(1)	(2)	(3)	(4)
Interest expense	21	22	42	44
Income before income taxes	331	310	559	552
Income taxes	49	61	91	103
Net income	$ 282	$ 249	$ 468	$ 449
Earnings per share:
Basic (dollars per share)	$ 0.59	$ 0.52	$ 0.98	$ 0.93
Diluted (dollars per share)	$ 0.59	$ 0.52	$ 0.97	$ 0.93