Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Income Statement [Abstract]
Net sales	$ 1,135	$ 1,079	$ 2,056	$ 1,975
Excise taxes	258	246	474	455
Cost of sales	268	257	478	467
Gross profit	609	576	1,104	1,053
Advertising expenses	123	111	223	214
Selling, general, and administrative expenses	178	162	348	318
Other expense (income), net	5	(8)	10	(7)
Operating income	303	311	523	528
Interest income	0	1	1	1
Interest expense	7	7	14	13
Income before income taxes	296	305	510	516
Income taxes	88	99	152	167
Net income	$ 208	$ 206	$ 358	$ 349
Earnings per share:
Basic (dollars per share)	$ 0.98	$ 0.97	$ 1.68	$ 1.63
Diluted (dollars per share)	$ 0.97	$ 0.96	$ 1.67	$ 1.62
Cash dividends per common share:
Declared (dollars per share)	$ 0.000	$ 0.000	$ 0.580	$ 0.510
Paid (dollars per share)	$ 0.290	$ 0.255	$ 0.580	$ 0.510