Cash Equivalents and Investments (Marketable Equity Securities) (Narrative) (Details) - Cash equivalents - USD ($)	12 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2024
Debt and Equity Securities, FV-NI
Securities unrealized gains (losses) recognized	$ 0	$ 0	$ 0
Money market funds \| Balance Sheet Location: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt and Equity Securities, FV-NI
Carrying value	$ 1,500,000,000	$ 1,200,000,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details