Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2022	Jul. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments	$ 108,000,000	$ 108,000,000		$ 98,000,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Upward adjustments to non-marketable equity securities	0	0	$ 46,000,000
Cumulative upward adjustments to non-marketable equity securities	$ 71,000,000	$ 71,000,000