Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Income Statement [Abstract]
Sales	$ 1,156	$ 1,059	$ 3,251	$ 2,969
Excise taxes	278	251	736	670
Net sales	878	808	2,515	2,299
Cost of sales	291	272	825	758
Gross profit	587	536	1,690	1,541
Advertising expenses	114	102	314	291
Selling, general, and administrative expenses	173	162	497	488
Other expense (income), net	(4)	(1)	(15)	(16)
Operating income	304	273	894	778
Interest income	2	1	4	2
Interest expense	17	16	49	44
Income before income taxes	289	258	849	736
Income taxes	99	76	242	212
Net income	$ 190	$ 182	$ 607	$ 524
Earnings per share:
Basic (dollars per share)	$ 0.39	$ 0.38	$ 1.26	$ 1.08
Diluted (dollars per share)	0.39	0.38	1.25	1.07
Cash dividends per common share:
Declared (dollars per share)	1.316	0.292	1.608	0.564
Paid (dollars per share)	$ 0.158	$ 0.146	$ 0.45	$ 0.418