Financing Receivables - Summary of Allowances for Credit Loss and Related Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	$ 109	$ 154	$ 127	$ 138
Provisions (benefits)	(10)	(8)	(28)	(9)
Recoveries (write-offs), net	(2)		(2)
Other		2		19
Allowance for credit loss, end of period	97	148	97	148
Lease Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	33	46	38	48
Provisions (benefits)	(4)	(4)	(9)	(7)
Recoveries (write-offs), net	(2)		(2)
Other		1		2
Allowance for credit loss, end of period	27	43	27	43
Loan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	74	101	86	81
Provisions (benefits)	(7)	(6)	(19)	(3)
Recoveries (write-offs), net	0		0
Other		1		18
Allowance for credit loss, end of period	67	96	67	96
Financed Service Contracts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	2	7	3	9
Provisions (benefits)	1	2	0	1
Recoveries (write-offs), net	0		0
Other		0		(1)
Allowance for credit loss, end of period	$ 3	$ 9	$ 3	$ 9