Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 25, 2020	Apr. 27, 2019	Jul. 27, 2019
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.36	$ 0.35	$ 1.06	$ 1.01
Payments of dividends	$ 1,500	$ 1,500	$ 4,491	$ 4,489
Remaining authorized repurchase amount	$ 10,800		$ 10,800
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement					$ 40