Borrowings (Short-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Oct. 26, 2013	Jul. 27, 2013
Short-term Debt [Line Items]
Debt, Current	$ 3,279	$ 3,283
Senior Notes [Member]
Short-term Debt [Line Items]
Debt, Current	3,269	3,273
Short-term debt, weighted-average interest rate	0.61%	0.63%
Short-term Debt [Member]
Short-term Debt [Line Items]
Debt, Current	$ 10	$ 10
Short-term debt, weighted-average interest rate	2.52%	2.52%