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Current Liabilities - Other Current Liabilities (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Jul. 31, 2019
Other Liabilities, Current [Abstract]    
Executive deferred compensation plan liabilities $ 113 $ 108
Current portion of operating lease liabilities 50  
Reserve for promotional discounts and rebates 15 11
Reserve for returns and credits 60 24
Current portion of deferred rent 0 6
Current portion of dividend payable 9 7
Other 38 42
Total other current liabilities $ 285 $ 198