Derivative Instruments - Effect of Derivative Instruments Not Designated as Hedges on Consolidated Statement of Operations Summary (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	$ (52)	$ 15	$ 82
Foreign currency derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	(60)	(24)	13
Total return swaps—deferred compensation | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	(16)	(11)	0
Total return swaps—deferred compensation | Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	19	50	53
Total return swaps—deferred compensation | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	2	4	5
Equity derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
GAINS (LOSSES) FOR THE YEARS ENDED	$ 3	$ (4)	$ 11