Supplemental Cash Flow Information (Schedule Of Statements Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Oct. 27, 2013	Oct. 28, 2012
Supplemental Cash Flow Information [Abstract]
Benefit related payments	$ (11)	$ (10)
Other	(1)	(1)
Total other cash used in operating activities	$ (12)	$ (11)

The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration