Cash Equivalents and Investments (Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Apr. 30, 2026	Jul. 31, 2025
Debt Securities, Available-for-sale
Amortized Cost	$ 4,943
Fair Value	4,956
Cash equivalents:
Debt Securities, Available-for-sale
Amortized Cost	612	$ 169
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	612	169
Cash equivalents: \| Commercial paper
Debt Securities, Available-for-sale
Amortized Cost	535	169
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	535	169
Cash equivalents: \| Corporate debt securities
Debt Securities, Available-for-sale
Amortized Cost	2
Unrealized Gains	0
Unrealized Losses	0
Fair Value	2
Cash equivalents: \| U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost	75
Unrealized Gains	0
Unrealized Losses	0
Fair Value	75
Investments:
Debt Securities, Available-for-sale
Amortized Cost	4,331	6,130
Unrealized Gains	24	56
Unrealized Losses	(11)	(1)
Fair Value	4,344	6,185
Investments: \| Corporate debt securities
Debt Securities, Available-for-sale
Amortized Cost	3,521	4,588
Unrealized Gains	20	47
Unrealized Losses	(10)	(1)
Fair Value	3,531	4,634
Investments: \| U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost	66	170
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	66	170
Investments: \| Commercial paper
Debt Securities, Available-for-sale
Amortized Cost	10	15
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	10	15
Investments: \| Non-U.S. government and agency securities
Debt Securities, Available-for-sale
Amortized Cost		29
Unrealized Gains		0
Unrealized Losses		0
Fair Value		29
Investments: \| Asset-backed securities
Debt Securities, Available-for-sale
Amortized Cost	734	1,328
Unrealized Gains	4	9
Unrealized Losses	(1)	0
Fair Value	$ 737	$ 1,337

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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