Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Segment Information and Major Customers (Additional Information) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 27, 2018 USD ($)	Jan. 28, 2017 USD ($)	Jan. 27, 2018 USD ($) segment	Jan. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of geographic segments (segment) \| segment			3
Revenue, total	$ 11,887	$ 11,580	$ 24,023	$ 23,932
International
Segment Reporting Information [Line Items]
Cash and cash equivalents and investments	71,300		71,300		$ 67,500
United States
Segment Reporting Information [Line Items]
Revenue, total	6,100	$ 5,900	12,600	$ 12,500
Cash and cash equivalents and investments	$ 2,400		$ 2,400		$ 3,000