Derivative Instruments (Derivatives Recorded at Fair Value) (Details) - USD ($) $ in Millions	Apr. 27, 2019	Jul. 28, 2018
Derivative [Line Items]
DERIVATIVE ASSETS	$ 36	$ 2
DERIVATIVE LIABILITIES	20	74
Derivatives designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	32	1
DERIVATIVE LIABILITIES	14	72
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	5	1
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	3	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	7	10
Derivatives designated as hedging instruments: | Interest rate derivatives | Other assets
Derivative [Line Items]
DERIVATIVE ASSETS	27	0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	4	62
Derivatives not designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	4	1
DERIVATIVE LIABILITIES	6	2
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	4	1
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	$ 6	$ 2