Derivative Instruments (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015
Derivative [Line Items]
Net derivative Gains/losses to be reclassified from AOCI into earnings in next twelve months	$ 54
Description of Interest Rate Derivative Activities	In fiscal 2016, the Company did not enter into any interest rate swaps. In prior fiscal years, the Company entered into interest rate swaps designated as fair value hedges related to fixed-rate senior notes that are due in fiscal 2017 through 2025. Under these interest rate swaps, the Company receives fixed-rate interest payments and makes interest payments based on LIBOR plus a fixed number of basis points.
Total fixed income securities
Derivative [Line Items]
Interest Rate Derivatives, at Fair Value, Net	$ 0	$ 0
Cash Flow Hedges
Derivative [Line Items]
Average derivative maturities, months	24 months
Net investment hedging instruments
Derivative [Line Items]
Average derivative maturities, months	6 months