Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020		Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 899	$ 904	$ 2,654		$ 2,580
Whiskey [Member]
Disaggregation of Revenue [Line Items]
Net sales	701	707	2,086	[1]	2,007	[1]
Tequila [Member]
Disaggregation of Revenue [Line Items]
Net sales	74	68	219	[2]	200	[2]
Vodka [Member]
Disaggregation of Revenue [Line Items]
Net sales	32	36	89	[3]	98	[3]
Wine [Member]
Disaggregation of Revenue [Line Items]
Net sales	62	51	159	[4]	153	[4]
Rest of portfolio [Member]
Disaggregation of Revenue [Line Items]
Net sales	15	16	40		38
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 15	$ 26	$ 61	[5]	$ 84	[5]

[1] Includes all whiskey spirits and whiskey-based flavored liqueurs, ready-to-drink, and ready-to-pour products. The brands included in this category are the Jack Daniel's family of brands, Woodford Reserve, Canadian Mist, GlenDronach, BenRiach, Glenglassaugh, Old Forester, Early Times, Slane Irish Whiskey, and Coopers’ Craft.

[2] Includes el Jimador, Herradura, New Mix, Pepe Lopez, and Antiguo.

[3] Includes Finlandia.

[4] Includes Korbel Champagne and Sonoma-Cutrer wines.

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