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Employee Benefit Plans - Summary of Restricted Stock and Stock Unit Awards (Details) - Restricted Stock/Stock Units - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
Restricted Stock/ Stock Units
Unvested, Beginning balance (in shares)	96	100	119
Granted and assumed (in shares)	51	49	45
Vested (in shares)	(39)	(44)	(50)
Canceled/forfeited/other (in shares)	(14)	(9)	(14)
Unvested, Ending balance (in shares)	94	96	100
Weighted-Average Grant Date Fair Value per Share
Unvested, Beginning balance (in dollars per share)	$ 42.03	$ 38.66	$ 30.56
Granted and assumed (in dollars per share)	41.89	42.61	47.71
Vested (in dollars per share)	39.63	35.20	29.25
Canceled/forfeited/other (in dollars per share)	42.13	40.45	32.01
Unvested, Ending balance (in dollars per share)	$ 42.93	$ 42.03	$ 38.66
Aggregate Fair  Value
Vested	$ 1,813	$ 2,045	$ 2,446

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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