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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Expense related to the Tax Act |  |  | $ 872
Undistributed earnings of certain foreign subsidiaries on which tax is not provided | $ 6,500 |  |
Unrecognized deferred income tax liability | 681 |  |
Gross income tax benefit attributable to tax incentives |  |  | $ 300
Gross income tax benefit attributable to tax incentives (in dollars per share) |  |  | $ 0.08
Unrecognized tax benefits that would affect the effective tax rate if realized | 2,300 |  |
Net interest expense, reduction related to unrecognized tax benefits | 74 | $ 104 | $ 30
Increase in unrecognized tax benefits for prior year tax positions | 618 | 554 | 84
Accrual for interest and penalties | 444 | 340 | $ 220
Unrecognized tax benefit that could be reduced in next 12 months | 800 |  |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 540 |  |
Tax credit carryforward | 31 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 1,100 |  |
Tax credit carryforward | 1,400 |  |
Tax credit carryforward, valuation allowance | 595 |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 617 |  |
Operating loss carryforwards, valuation allowance | 104 |  |
Tax credit carryforward | $ 7 |  |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax examination, benefit from settlement |  | 102 |
Internal Revenue Service (IRS) | Interest expense |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax examination, benefit from settlement |  | $ 4 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817 + Details
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