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Borrowings (Short-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Apr. 28, 2012	Jul. 30, 2011
Short-term Debt [Line Items]
Short-term debt, Weighted-Average Interest Rate
Short-term debt	$ 83	$ 588
Other Notes And Borrowings [Member]
Short-term Debt [Line Items]
Interest rate other short term borrowings	5.88%	4.59%
Short-term debt	83	88
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term debt, Weighted-Average Interest Rate		0.14%
Short-term debt		$ 500

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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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.

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