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Available-for-Sale Debt Investments and Equity Investments - Additional Information (Details) | 12 Months Ended
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Jul. 27, 2019 USD ($) entity | Jul. 28, 2018 USD ($) | Jul. 29, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |
Impairment charges of available-for-sale investments | $ 0 | $ 52,000,000 | $ 74,000,000
Average daily balance of securities lending | $ 1,100,000,000 | 300,000,000 |
Fair value of securities received as collateral that can be resold or repledged, percentage (at least) | 102.00% |  |
Secured lending transactions outstanding | $ 0 | $ 0 |
Number of variable interest entities required to be consolidated (entity) | entity | 0 |  |
Schedule of Investments [Line Items] |  |  |
Investments in privately held companies | $ 1,200,000,000 |  |
Funding commitments | 326,000,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Schedule of Investments [Line Items] |  |  |
Investments in privately held companies | $ 656,000,000 |  |

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- Definition Fair value of securities received as collateral that can be resold or repledged percentage. + References No definition available. + Details
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- Definition Secured Lending Transactions Outstanding + References No definition available. + Details
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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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