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Current Liabilities - Other Current Liabilities (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Jul. 31, 2018
Other Liabilities, Current [Abstract]    
Executive deferred compensation plan liabilities $ 109 $ 97
Reserve for promotional discounts and rebates 22 10
Reserve for product returns 48 17
Current portion of license fee payable 10 9
Current portion of deferred rent 6 6
Current portion of dividend payable 9 10
Other 50 46
Total other current liabilities $ 254 $ 195