Net Sales by Product Category (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales		$ 3,363	$ 3,324	$ 3,248
Whiskey [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	2,671	2,595	2,533
Tequila [Member]
Disaggregation of Revenue [Line Items]
Net sales	[2]	275	263	247
Vodka [Member]
Disaggregation of Revenue [Line Items]
Net sales	[3]	186	187	187
Wine [Member]
Disaggregation of Revenue [Line Items]
Net sales	[4]	109	126	130
Rest of portfolio [Member]
Disaggregation of Revenue [Line Items]
Net sales		47	46	54
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	[5]	$ 75	$ 107	$ 97

[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.