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Commitments and Contingencies Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Commitments (Textual) [Abstract]      
Rental payment under operating leases $ 23us-gaap_LeaseAndRentalExpense $ 24us-gaap_LeaseAndRentalExpense $ 22us-gaap_LeaseAndRentalExpense
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum lease payment, 2016 17us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Minimum lease payment, 2017 13us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Minimum lease payment, 2018 6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Minimum lease payment, 2019 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Minimum lease payment, 2020 1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Minimum lease payment, after 2020 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]      
Total purchase obligation, 2016 7us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary    
Total purchase obligation, 2017 5us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary    
Total purchase obligation, 2018 2us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary    
Total purchase obligation, 2019 2us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary    
Total purchase obligation, 2020 1us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary    
Total purchase obligation, after 2020 1us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears    
Agave [Member]      
Commitments (Textual) [Abstract]      
Agave purchase contract, period (years) 10 years    
Total obligations $ 3us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= bfb_AgaveMember