Net Sales by Product Category (Details) - USD ($) $ in Millions		3 Months Ended
		Jul. 31, 2019	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales		$ 766	$ 766
Whiskey [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	600	597
Tequila [Member]
Disaggregation of Revenue [Line Items]
Net sales	[2]	68	62
Vodka [Member]
Disaggregation of Revenue [Line Items]
Net sales	[3]	26	28
Wine [Member]
Disaggregation of Revenue [Line Items]
Net sales	[4]	39	40
Rest of portfolio [Member]
Disaggregation of Revenue [Line Items]
Net sales		11	11
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	[5]	$ 22	$ 28

[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.