Segment Information and Major Customers - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jan. 25, 2020 USD ($)	Jan. 26, 2019 USD ($)	Jan. 25, 2020 USD ($) segment	Jan. 26, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of geographic segments \| segment			3
Revenue	$ 12,005	$ 12,446	$ 25,164	$ 25,518
United States
Segment Reporting Information [Line Items]
Revenue	$ 6,200	$ 6,400	$ 13,300

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration