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Income Taxes - Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 3,657	$ 2,681
Provision for income taxes	$ 677	$ 507
Effective tax rate	18.50%	18.90%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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