Fair Value (Reconciliation For All Assets Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Detail) (Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
Jul. 28, 2012	Jul. 30, 2011
Assets And Liabilities At Fair Value On A Recurring Basis [Line Items]
Beginning balance	$ 123	$ 152
Included in other income, net	3	2
Included in other comprehensive income	(3)
Purchases, sales and maturities	(15)	(31)
Transfer into Level 2	(107)
Ending balance	1	123
Losses attributable to assets still held		(1)
Asset-Backed Securities
Assets And Liabilities At Fair Value On A Recurring Basis [Line Items]
Beginning balance	121	149
Included in other income, net	3	3
Included in other comprehensive income	(3)
Purchases, sales and maturities	(14)	(31)
Transfer into Level 2	(107)
Ending balance		121
Derivative Assets
Assets And Liabilities At Fair Value On A Recurring Basis [Line Items]
Beginning balance	2	3
Included in other income, net		(1)
Purchases, sales and maturities	(1)
Ending balance	1	2
Losses attributable to assets still held		$ (1)

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Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Losses Attributable To Assets Still Held

+ References

No definition available.

+ Details

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

+ References

+ Details

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- Definition

This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Balance Type:	credit
Period Type:	duration

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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