Borrowings (Short-Term Debt) (Detail) (Notes Payable, Other Payables [Member], USD $) In Millions, unless otherwise specified	Oct. 27, 2012	Jul. 28, 2012
Notes Payable, Other Payables [Member]
Short-term Debt [Line Items]
Short-term debt	$ 55	$ 31
Short-term debt, weighted-average interest rate	7.75%	6.72%

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.

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

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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant