Derivative Instruments - Effect of Derivative Instruments Not Designated as Hedges on Consolidated Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019	Jul. 28, 2018
Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	$ 0	$ 1
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	0	0
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	19	(52)	$ 15
Derivatives not designated as hedging instruments | Foreign currency derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	(5)	(60)	(24)
Derivatives not designated as hedging instruments | Total return swaps—deferred compensation | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	(10)	(16)	(11)
Derivatives not designated as hedging instruments | Total return swaps—deferred compensation | Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	24	19	50
Derivatives not designated as hedging instruments | Total return swaps—deferred compensation | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	1	2	4
Derivatives not designated as hedging instruments | Equity derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	$ 9	$ 3	$ (4)