Cash Equivalents and Investments - Schedule of Unrealized Loss Position and Fair Value of Debt Securities (Details) $ in Millions	Jul. 31, 2023 USD ($)
Schedule of Investments [Line Items]
Estimated Fair Value, Less Than 12 Months	$ 1,266
Unrealized Losses, Less Than 12 Months	(5)
Estimated Fair Value, More Than 12 Months	459
Unrealized Losses, More Than 12 Months	(5)
Estimated Fair Value	1,725
Unrealized Losses	(10)
U.S. treasury securities
Schedule of Investments [Line Items]
Estimated Fair Value, Less Than 12 Months	1,248
Unrealized Losses, Less Than 12 Months	(5)
Estimated Fair Value, More Than 12 Months	447
Unrealized Losses, More Than 12 Months	(5)
Estimated Fair Value	1,695
Unrealized Losses	(10)
Corporate debt securities
Schedule of Investments [Line Items]
Estimated Fair Value, Less Than 12 Months	18
Unrealized Losses, Less Than 12 Months	0
Estimated Fair Value, More Than 12 Months	12
Unrealized Losses, More Than 12 Months	0
Estimated Fair Value	30
Unrealized Losses	$ 0