Financing Receivables - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	May 01, 2021	Jul. 25, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease receivables terms, on average	4 years
Loan receivables term	3 years
Threshold for past due receivables	31 days
Financing receivable, 120 days plus past due but on accrual status	$ 35	$ 67
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financed service contracts term	1 year
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financed service contracts term	3 years