Derivative Instruments (Derivatives Recorded At Fair Value) (Details) - USD ($) $ in Millions	Jul. 25, 2015	Jul. 26, 2014
Derivative [Line Items]
DERIVATIVE ASSETS	$ 218	$ 160
DERIVATIVE LIABILITIES	12	67
Derivatives designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	212	155
DERIVATIVE LIABILITIES	11	65
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	10	7
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	11	6
Derivatives designated as hedging instruments: | Interest rate derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	202	148
Derivatives designated as hedging instruments: | Interest rate derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	0	3
Derivatives designated as hedging instruments: | Equity derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	0	0
Derivatives designated as hedging instruments: | Equity derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	0	56
Derivatives not designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	6	5
DERIVATIVE LIABILITIES	1	2
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	2	3
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	1	2
Derivatives not designated as hedging instruments: | Equity derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	4	2
Derivatives not designated as hedging instruments: | Equity derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	$ 0	$ 0