Cash, Cash Equivalents and Investments - Summary of Contractual Maturity (Details) $ in Millions	Jul. 31, 2022 USD ($)
Contractual maturities of investments
Due in one year or less, Cost	$ 571
Due after one through five years, Cost	880
Due after five years, Cost	2
No single maturity date, Cost	1,111
Total short-term and long-term investments cost	2,564
Due in one year or less, Estimated Fair Value	568
Due after one through five years, Estimated Fair Value	854
Due after five years, Estimated Fair Value	2
No single maturity date, Estimated Fair Value	1,215
Estimated fair value of short-term and long-term investments	$ 2,639