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Income Taxes - Breakdown Between Current and Noncurrent Net Deferred Tax Assets (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 29, 2018 | Jul. 28, 2018
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Deferred Tax Assets, Net [Abstract] |  |  |
Deferred tax assets | $ 4,065 | $ 3,995 | $ 3,219
Deferred tax liabilities | (95) |  | (141)
Total net deferred tax assets | $ 3,970 |  | $ 3,078

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