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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Allowance for Accounts Receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of fiscal year | $ 143 | $ 136 | $ 129
Provisions (benefits)/Additions | 21 | 55 | 56
Recoveries (write-offs), net/Deductions | (29) | (48) | (50)
Foreign exchange and other | (26) | 0 | 1
Balance at end of fiscal year | 109 | 143 | 136
Allowance for Financing Receivables |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of fiscal year | 138 | 126 | 205
Provisions (benefits)/Additions | (27) | 38 | (16)
Recoveries (write-offs), net/Deductions | (2) | (22) | (42)
Foreign exchange and other | 18 | (4) | (21)
Balance at end of fiscal year | 127 | 138 | 126
Deferred Tax Asset Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of fiscal year | 700 | 457 | 374
Provisions (benefits)/Additions | 91 | 279 | 112
Recoveries (write-offs), net/Deductions | (5) | (29) | (20)
Write-offs | (16) | (7) | (8)
Foreign exchange and other | 1 | 0 | (1)
Balance at end of fiscal year | $ 771 | $ 700 | $ 457

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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