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- Definition

In The Money Exercisable Stock Option Shares

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Number of stock incentive plans.

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PRSU allocation between Financial operating goals and TSR (in percentage)

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- Definition

Reduction in number of shares available for issuance after amendment approved by shareholders.

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Shares available for issuance

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Stock options and stock appreciation rights exercise price percentage of the fair market value of the underlying stock on the grant date

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on offering date that participants pay for 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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Employee Benefit Plans (Additional Information) (Details) $ / shares in Units, $ in Billions		3 Months Ended		6 Months Ended
	Nov. 12, 2009 shares	Jan. 26, 2019 USD ($) stock_incentive_plan shares	Jan. 27, 2018 shares	Jan. 26, 2019 USD ($) stock_incentive_plan shares	Jan. 27, 2018 shares	Oct. 26, 2018 $ / shares	Jul. 28, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans (stock incentive plan) \| stock_incentive_plan		1		1
Total compensation cost related to unvested share-based awards \| $		$ 3.2		$ 3.2
Expected period of recognition of compensation cost				2 years 8 months 6 days
Closing stock price (in dollars per share) \| $ / shares						$ 46.13
In-the-money exercisable stock option shares (in shares)		3,000,000		3,000,000
Number Exercisable (in shares)							4,000,000
Weighted- average exercise price per share (in dollars per share) \| $ / shares							$ 6.84
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)		721,400,000.0		721,400,000.0
Expiration date for stock options and stock appreciation rights				24 months
Shares eligible for employees purchase, percentage of discount				15.00%
Shares issued under employee purchase plan, shares (in shares)		9,000,000	12,000,000	9,000,000	12,000,000
Shares available for issuance (in shares)		169,000,000		169,000,000
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)		694,000,000		694,000,000
Exercise price as a percentage of market value for Options	100.00%
Award requisite service period				3 years
PRSU allocation between Financial operating goals and TSR				50.00%
2005 Plan \| Stock awards subsequent to November 12, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (in shares)	1.5	1.5		1.5
2005 Plan \| Stock awards subsequent to November 12, 2009 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration date for stock options and stock appreciation rights	10 years
2005 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				1 year
2005 Plan \| Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				25.00%
Award requisite service period				48 months
2005 Plan \| Employee Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				20.00%
Award requisite service period				36 months
2005 Plan \| Performance base and Market base RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period				3 years
2005 Plan \| Performance based RSU based on Financial or nonFinancial operating goal \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period				3 years
2005 Plan \| Performance based RSU based on Financial or nonFinancial operating goal \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period				6 months
2005 Plan \| PRSU based on financial performance metrics \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				150.00%
2005 Plan \| PRSU based on financial performance metrics \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				0.00%
2005 Plan \| PRSU based on TSR \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				150.00%
2005 Plan \| PRSU based on TSR \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				0.00%
2005 Plan \| PRSU based on nonfinancial operating goals \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				100.00%
2005 Plan \| PRSU based on nonfinancial operating goals \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, percentage				0.00%
2005 Plan \| Time Based Stock Grants And Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years