Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Income Statement [Abstract]
Net sales	$ 1,093	$ 1,078	$ 3,149	$ 3,053
Excise taxes	280	296	754	751
Cost of sales	260	250	738	717
Gross profit	553	532	1,657	1,585
Advertising expenses	112	116	334	329
Selling, general, and administrative expenses	163	161	512	479
Other expense (income), net	6	0	16	(6)
Operating income	272	255	795	783
Interest income	0	0	1	2
Interest expense	6	6	21	20
Income before income taxes	266	249	775	765
Income taxes	80	72	232	239
Net income	$ 186	$ 177	$ 543	$ 526
Earnings per share:
Basic (dollars per share)	$ 0.88	$ 0.83	$ 2.56	$ 2.46
Diluted (dollars per share)	$ 0.87	$ 0.82	$ 2.54	$ 2.45
Cash dividends per common share:
Declared (dollars per share)	$ 0.630	$ 0.580	$ 1.210	$ 1.090
Paid (dollars per share)	$ 0.315	$ 0.290	$ 0.895	$ 0.800