Derivative Instruments - Effect of Derivative Instruments Not Designated as Hedges on Consolidated Statements of Operations (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	$ 38	$ (157)	$ 198	$ (120)
Foreign currency derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(12)	(47)	35	(56)
Total return swaps—deferred compensation | Operating expenses and other
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	45	(104)	144	(63)
Equity derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	$ 5	$ (6)	$ 19	$ (1)