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Current Liabilities - Other Current Liabilities (Details) - USD ($)
$ in Millions
Jul. 31, 2018
Jul. 31, 2017
Other Liabilities Disclosure [Abstract]    
Executive deferred compensation plan liabilities $ 97 $ 83
Reserve for promotional discounts and rebates 10 19
Reserve for product returns 10 7
Current portion of license fee payable 9 10
Current portion of deferred rent 6 6
Current portion of dividend payable 10 9
Other 49 44
Total other current liabilities $ 191 $ 178