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Income Taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - Deferred tax asset valuation allowance - USD ($) $ in Millions | 12 Months Ended
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Jul. 27, 2024 | Jul. 29, 2023 | Jul. 30, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of fiscal year | $ 754 | $ 834 | $ 771
Additions | 148 | 35 | 84
Additions from Splunk | 147 | 0 | 0
Deductions | (4) | (18) | (10)
Write-offs | (20) | (93) | (12)
Foreign exchange and other | (1) | (4) | 1
Balance at end of fiscal year | $ 1,024 | $ 754 | $ 834

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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