Derivative Instruments (Derivatives Recorded at Fair Value) (Details) - USD ($) $ in Millions	Jan. 26, 2019	Jul. 28, 2018
Derivative [Line Items]
DERIVATIVE ASSETS	$ 23	$ 2
DERIVATIVE LIABILITIES	40	74
Derivatives designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	13	1
DERIVATIVE LIABILITIES	36	72
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	1	1
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	8	0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	0	0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	13	10
Derivatives designated as hedging instruments: | Interest rate derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	12	0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	15	62
Derivatives not designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	10	1
DERIVATIVE LIABILITIES	4	2
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	10	1
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	$ 4	$ 2