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Commitments and Contingencies Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Commitments (Textual) [Abstract]      
Rental payment under operating leases $ 23 $ 23 $ 23
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum lease payment, 2018 17    
Minimum lease payment, 2019 13    
Minimum lease payment, 2020 9    
Minimum lease payment, 2021 5    
Minimum lease payment, 2022 3    
Minimum lease payment, after 2022 1    
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]      
Total purchase obligation, 2018 12    
Total purchase obligation, 2019 9    
Total purchase obligation, 2020 6    
Total purchase obligation, 2021 4    
Total purchase obligation, 2022 3    
Total purchase obligation, after 2022 $ 1    
Agave [Member]      
Commitments (Textual) [Abstract]      
Agave purchase contract, period (years) 10 years    
Total obligations $ 4