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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018
--- | --- | ---
ASSETS |  |
Allowance for doubtful accounts and returns | $ 127 | $ 285
Sales-type and direct-financing leases | 176 | 171
Inventory write-downs and capitalization | 409 | 289
Investment provisions | 0 | 54
IPR&D, goodwill, and purchased intangible assets | 1,427 | 63
Deferred revenue | 1,150 | 1,584
Credits and net operating loss carryforwards | 1,241 | 1,087
Share-based compensation expense | 164 | 190
Accrued compensation | 342 | 370
Other | 419 | 408
Gross deferred tax assets | 5,455 | 4,501
Valuation allowance | (457) | (374)
Total deferred tax assets | 4,998 | 4,127
LIABILITIES |  |
Purchased intangible assets | (705) | (753)
Depreciation | (141) | (118)
Unrealized gains on investments | (70) | (33)
Other | (112) | (145)
Total deferred tax liabilities | (1,028) | (1,049)
Total net deferred tax assets | $ 3,970 | $ 3,078

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