Net Sales by Geography (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021		Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 911	$ 899	$ 2,649		$ 2,654
United States [Member]
Disaggregation of Revenue [Line Items]
Net sales	425	416	1,334		1,296
Developed International [Member]
Disaggregation of Revenue [Line Items]
Net sales	292	263	789	[1]	716	[1]
Emerging [Member]
Disaggregation of Revenue [Line Items]
Net sales	171	171	438	[2]	477	[2]
Travel Retail [Member]
Disaggregation of Revenue [Line Items]
Net sales	12	34	47	[3]	104	[3]
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 11	$ 15	$ 41	[4]	$ 61	[4]

[1] Represents net sales of branded products to “advanced economies” as defined by the International Monetary Fund (IMF), excluding the United States. Our largest developed international markets are the United Kingdom, Germany, Australia, and France.

[2] Represents net sales of branded products to “emerging and developing economies” as defined by the IMF. Our largest emerging markets are Mexico, Poland, and Russia.

[3] Represents net sales of branded products to global duty-free customers, other travel retail customers, and the U.S. military regardless of customer location.

[4] Includes net sales of used barrels, bulk whiskey and wine, and contract bottling regardless of customer location.