Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021	Jul. 31, 2021
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)	$ 0.38	$ 0.37	$ 1.12	$ 1.09
Payments of dividends	$ 1,600	$ 1,600	$ 4,657	$ 4,601
Remaining authorized repurchase amount	17,600		17,600
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement	$ 10		$ 10		$ 25

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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