Net Sales by Geography (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021		Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 994	$ 985	$ 1,900		$ 1,738
United States [Member]
Disaggregation of Revenue [Line Items]
Net sales	462	522	912		909
Developed International [Member]
Disaggregation of Revenue [Line Items]
Net sales	297	266	566	[1]	497	[1]
Emerging [Member]
Disaggregation of Revenue [Line Items]
Net sales	187	160	337	[2]	267	[2]
Travel Retail [Member]
Disaggregation of Revenue [Line Items]
Net sales	28	22	49	[3]	35	[3]
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 20	$ 15	$ 36	[4]	$ 30	[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 Australia, Germany, the United Kingdom, France, and Canada.

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