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Income Taxes - Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 23, 2021 | Jan. 25, 2020 | Jan. 23, 2021 | Jan. 25, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Income before provision for income taxes | $ 3,255 | $ 3,534 | $ 5,936 | $ 7,220
Provision for income taxes | $ 710 | $ 656 | $ 1,217 | $ 1,416
Effective tax rate | 21.80% | 18.60% | 20.50% | 19.60%

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