Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019		Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 989	$ 910	$ 1,755		$ 1,676
Whiskey [Member]
Disaggregation of Revenue [Line Items]
Net sales	785	703	1,385	[1]	1,300	[1]
Tequila [Member]
Disaggregation of Revenue [Line Items]
Net sales	77	70	145	[2]	132	[2]
Vodka [Member]
Disaggregation of Revenue [Line Items]
Net sales	31	34	57	[3]	62	[3]
Wine [Member]
Disaggregation of Revenue [Line Items]
Net sales	58	62	97	[4]	102	[4]
Rest of portfolio [Member]
Disaggregation of Revenue [Line Items]
Net sales	14	11	25		22
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 24	$ 30	$ 46	[5]	$ 58	[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.