Employee Benefit Plans (Summary of Share-Based Awards available for Grant) (Details) - shares shares in Millions	9 Months Ended	12 Months Ended
Apr. 30, 2016	Jul. 25, 2015
Employee Stock Benefit Plans [Abstract]
Balance at beginning of fiscal period	276	310
Restricted stock, stock units, and other share-based awards granted	(68)	(101)
Share-based awards canceled/forfeited/expired	26	40
Shares withheld for taxes and not issued	26	27
Other	1
Balance at end of fiscal period	261	276

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant