Derivative Instruments (Derivatives Recorded at Fair Value) (Details) - USD ($) $ in Millions	Oct. 27, 2018	Jul. 28, 2018
Derivative [Line Items]
DERIVATIVE ASSETS	$ 6	$ 2
DERIVATIVE LIABILITIES	91	74
Derivatives designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	4	1
DERIVATIVE LIABILITIES	87	72
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	4	1
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	6	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	0	0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other long-term liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	74	62
Derivatives not designated as hedging instruments:
Derivative [Line Items]
DERIVATIVE ASSETS	2	1
DERIVATIVE LIABILITIES	4	2
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	1	1
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	4	2
Derivatives not designated as hedging instruments: | Total return swaps—deferred compensation | Other current assets
Derivative [Line Items]
DERIVATIVE ASSETS	1	0
Derivatives not designated as hedging instruments: | Total return swaps—deferred compensation | Other current liabilities
Derivative [Line Items]
DERIVATIVE LIABILITIES	$ 0	$ 0