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Current Liabilities - Other Current Liabilities (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Jul. 31, 2019
Other Liabilities, Current [Abstract]    
Executive deferred compensation plan liabilities $ 122 $ 108
Current portion of operating lease liabilities 55  
Reserve for promotional discounts and rebates 12 11
Reserve for returns and credits 26 24
Current portion of deferred rent 0 6
Current portion of dividend payable 8 7
Other 44 46
Total other current liabilities $ 267 $ 202