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Cash Equivalents and Investments (Marketable Equity Securities) (Narrative) (Details) - Marketable equity securities - Money market funds - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2026	Apr. 30, 2025	Jul. 31, 2025
Debt and Equity Securities, FV-NI
Securities unrealized gains (losses) recognized	$ 0	$ 0	$ 0	$ 0
Cash and cash equivalents
Debt and Equity Securities, FV-NI
Carrying value	$ 944		$ 944		$ 1,200