Net Sales by Product Category (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales		$ 3,324	$ 3,248	$ 2,994
Whiskey [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	2,608	2,543	2,328
Tequila [Member]
Disaggregation of Revenue [Line Items]
Net sales	[2]	263	247	214
Vodka [Member]
Disaggregation of Revenue [Line Items]
Net sales	[3]	124	130	118
Wine [Member]
Disaggregation of Revenue [Line Items]
Net sales	[4]	187	187	188
Rest of portfolio [Member]
Disaggregation of Revenue [Line Items]
Net sales		46	54	58
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	[5]	$ 96	$ 87	$ 88

[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.