Derivative Instruments (Derivatives Recorded At Fair Value) (Details) - USD ($) $ in Millions	Jul. 30, 2016	Jul. 25, 2015
Derivative [Line Items]
DERIVATIVE ASSETS	$ 385	$ 218
DERIVATIVE LIABILITIES	54	12
Derivatives designated as hedging instruments
Derivative [Line Items]
DERIVATIVE ASSETS	384	212
DERIVATIVE LIABILITIES	53	11
Derivatives designated as hedging instruments | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	7	10
Derivatives designated as hedging instruments | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	53	11
Derivatives designated as hedging instruments | Interest rate derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	11	22
Derivatives designated as hedging instruments | Interest rate derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	366	180
Derivatives designated as hedging instruments | Interest rate derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	0	0
Derivatives designated as hedging instruments | Equity derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	0	0
Derivatives not designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	1	6
DERIVATIVE LIABILITIES	1	1
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	0	2
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	1	1
Derivatives not designated as hedging instruments: | Equity derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	1	4
Derivatives not designated as hedging instruments: | Equity derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	$ 0	$ 0