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Employee Benefit Plans - Valuation of Employee Share-Based Awards - Time-Based Restricted Stock Units (Details) - $ / shares shares in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	48	47	43
Grant date fair value per share (in dollars per share)	$ 42.04	$ 42.68	$ 47.75
Expected dividend	3.30%	3.10%	2.70%
Range of risk-free interest rates, minimum	0.00%	0.00%	0.00%
Range of risk-free interest rates, maximum	0.90%	2.00%	2.90%
PERFORMANCE BASED RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)	2	2	2
Grant date fair value per share (in dollars per share)	$ 37.91	$ 41.91	$ 47.00
Expected dividend	3.60%	2.80%	2.80%
Range of risk-free interest rates, minimum	0.10%	1.70%	2.10%
Range of risk-free interest rates, maximum	0.40%	2.00%	3.00%

X

- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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