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Fair Value Measurements and Investments - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 3,382	$ 5,412
Gross Unrealized Gains	15	44
Gross Unrealized Losses	0	(5)
Fair Value	3,397	5,451
U.S. government-sponsored debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	303	492
Gross Unrealized Gains	1	4
Gross Unrealized Losses	0	0
Fair Value	304	496
U.S. Treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,079	4,920
Gross Unrealized Gains	14	40
Gross Unrealized Losses	0	(5)
Fair Value	$ 3,093	$ 4,955

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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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