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Supplemental Information (Net Sales by Product Category) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Net sales:      
Net sales $ 4,096us-gaap_SalesRevenueGoodsNet $ 3,946us-gaap_SalesRevenueGoodsNet $ 3,784us-gaap_SalesRevenueGoodsNet
Spirits [Member]      
Net sales:      
Net sales 3,903us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_SpiritsMember		 3,765us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_SpiritsMember		 3,613us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_SpiritsMember
Wine [Member]      
Net sales:      
Net sales $ 193us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_WineMember		 $ 181us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_WineMember		 $ 171us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= bfb_WineMember