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
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	$ (132)	$ 38	$ (207)	$ 198
Foreign currency derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(99)	(12)	(155)	35
Total return swaps—deferred compensation | Operating expenses and other
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(38)	45	(58)	144
Equity derivatives | Other income (loss), net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	$ 5	$ 5	$ 6	$ 19