Fair Value (Narrative) (Details) (USD $)	9 Months Ended
Apr. 28, 2012	Jul. 30, 2011
Fair Value [Abstract]
Value of investments in privately held companies on cost basis	$ 245,000,000
Aggregate carrying value of long-term loan receivables and financed service contracts and other	1,800,000,000
Long-term debt, fair value	18,200,000,000
Long-term debt, carrying amount	$ 16,286,000,000	$ 16,234,000,000

Loan receivables and financed service contracts and others carrying value.

No definition available.

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- Definition

Value of investments in privately held companies on a cost basis.

+ References

No definition available.

+ Details

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- Details

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

+ Details

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