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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
ASSETS    
Allowance for accounts receivable and returns $ 68 $ 110
Sales-type and direct-financing leases 157 179
Inventory write-downs and capitalization 392 350
Deferred foreign income 164 253
IPR&D and purchased intangible assets 1,195 1,289
Deferred revenue 1,526 1,182
Credits and net operating loss carryforwards 1,264 1,105
Share-based compensation expense 123 135
Accrued compensation 333 353
Lease liabilities 277 240
Capitalized research expenditures 303 223
Other 454 348
Gross deferred tax assets 6,256 5,767
Valuation allowance (771) (700)
Total deferred tax assets 5,485 5,067
LIABILITIES    
Goodwill and purchased intangible assets (686) (577)
Depreciation (164) (179)
Unrealized gains on investments (112) (119)
ROU lease assets (260) (222)
Other (37) (61)
Total deferred tax liabilities (1,259) (1,158)
Total net deferred tax assets $ 4,226 $ 3,909