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Gain on Sale of Business (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Mar. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Not Discontinued Operations, Transaction Costs   $ 9    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 0 $ 0 $ 485  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration       $ 543
Disposal Group, Including Discontinued Operation, Assets, Current       49
Disposal Group, Including Discontinued Operation, Inventory, Current       11
Disposal Group, Including Discontinued Operation, Goodwill, Current       16
Disposal Group, Including Discontinued Operation, Intangible Assets, Current       $ 22