Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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- Definition

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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No definition available.

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Percentage of vesting of share-based compensation awards.

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Stock-based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Oct. 30, 2016	Nov. 01, 2015	Jul. 31, 2016
Stock-based Compensation
Pre-tax stock-based compensation expense	$ 14	$ 13
Tax-related benefits	5	5
Cash received from the exercise of stock options	0	1
Excess Tax Benefit from Share-based Compensation, Operating Activities	6	6
Employee Stock Option [Member]
Stock-based Compensation
Remaining unearned compensation on nonvested awards	$ 4
Weighted-average remaining service period, years	1 year 5 months
EPS Performance Restricted Stock Units [Member]
Stock-based Compensation
Nonvested, Units	155
Nonvested, Weighted-Average Grant-Date Fair Value	$ 49.89
Strategic Performance Restricted Stock Units [Member]
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	35.00%
Time Lapse E P S, Strategic Performance and Special Performance Restricted Stock Units [Member]
Stock-based Compensation
Remaining unearned compensation on nonvested awards	$ 42
Weighted-average remaining service period, years	1 year 10 months
Nonvested, Units	1,312		2,004
Nonvested, Weighted-Average Grant-Date Fair Value	$ 50.45		$ 45.08
Fair value of restricted units and shares vested	$ 50	$ 40
Granted, Weighted-Average Grant-Date Fair Value	$ 54.72	$ 49.94
TSR Performance Restricted Stock/Units [Member]
Stock-based Compensation
Remaining unearned compensation on nonvested awards	$ 46
Weighted-average remaining service period, years	2 years 1 month
Nonvested, Units	1,872		1,641
Nonvested, Weighted-Average Grant-Date Fair Value	$ 48.25		$ 49.13
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	75.00%	100.00%
Fair value of restricted units and shares vested	$ 14	$ 22
Granted, Weighted-Average Grant-Date Fair Value	$ 39.53	$ 62.44
Minimum [Member] \| EPS Performance Restricted Stock Units [Member]
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum [Member] \| EPS Performance Restricted Stock Units [Member]
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Financial [Member] \| Special Performance Restricted Stock Units [Member]
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Milestones [Member] \| Special Performance Restricted Stock Units [Member]
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%