Borrowings (Short-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 27, 2013	Jul. 28, 2012
Short-term Debt [Line Items]
Current portion of long-term debt	$ 3,279	$ 0
Short-term debt	13	31
Debt, Current	3,292	31
Current portion of long term debt [Member]
Short-term Debt [Line Items]
Current portion of long-term debt	$ 3,279	$ 0
Short-term debt, weighted-average interest rate	0.64%	0.00%
Notes Payable, Other Payables [Member]
Short-term Debt [Line Items]
Short-term debt, weighted-average interest rate	9.60%	6.72%

Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

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+ Details

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Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

+ References

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

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