Derivative Instruments (Additional Information) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended
	Jan. 25, 2014	Jan. 25, 2014 Fixed Income Securities	Jul. 27, 2013 Fixed Income Securities	Jan. 25, 2014 Senior Notes	Jan. 25, 2014 Cash Flow Hedging Foreign Currency Derivatives	Jan. 25, 2014 Net Investment Hedging
Derivative [Line Items]
Derivative, Term of Contract					18 months	6 months
Number of Interest Rate Derivatives Held		0	0
Net derivative gains to be reclassified from AOCI into earnings in next twelve months	$ 25
Description of Interest Rate Derivative Activities				In fiscal 2014 and 2013, the Company entered into interest rate swaps designated as fair value hedges related to fixed-rate senior notes that were issued in February 2009 and November 2009 and are due in 2019 and 2020, respectively. In the previous periods, the Company entered into interest rate swaps designated as fair value hedges related to fixed-rate senior notes that were issued in 2006 and 2011 and are due in 2014, 2016, and 2017.