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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Oct. 26, 2019
Income Tax Contingency [Line Items]
Benefit for provision for income taxes	$ (656)	$ (521)	$ (1,416)	$ (881)
Unrecognized tax benefits	2,000		2,000
Unrecognized tax benefits that would impact effective tax rate	1,700		1,700
Unrecognized tax benefits approximately reduced in next 12 months	$ 50		$ 50
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Income tax examination, adjustment from settlement					$ 102
Internal Revenue Service (IRS) \| Interest expense
Income Tax Contingency [Line Items]
Income tax examination, adjustment from settlement					$ 4
Accounting Standards Update 2014-09
Income Tax Contingency [Line Items]
Benefit for provision for income taxes				$ 152