Fair Value Measurements and Investments (Tables)

12 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Measurements as of September 30 Using Inputs Considered as
	Level 1				Level 2
	2024		2023		2024		2023
	(in millions)
Assets
Cash equivalents and restricted cash equivalents:
Money market funds	$	10,403	$	13,504	$	—	$	—
U.S. Treasury securities	7		301		—		—
Investment securities:
Marketable equity securities	301		339		—		—
U.S. government-sponsored debt securities	—		—		496		1,108
U.S. Treasury securities	4,948		4,316		—		—
Other current and non-current assets:
Money market funds	25		23		—		—
Derivative instruments	—		—		103		293
Total	$	15,684	$	18,483	$	599	$	1,401
Liabilities
Accrued compensation and benefits:
Deferred compensation liability	$	238	$	175	$	—	$	—
Accrued and other liabilities:
Derivative instruments	—		—		226		396
Total	$	238	$	175	$	226	$	396

Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Value of Debt Securities

The amortized cost, unrealized gains and losses and fair value of debt securities were as follows:

	September 30, 2024
	Amortized Cost		Gross Unrealized				Fair Value
			Gains		Losses
	(in millions)
U.S. government-sponsored debt securities	$	492	$	4	$	—	$	496
U.S. Treasury securities	4,920		40		(5)		4,955
Total	$	5,412	$	44	$	(5)	$	5,451

	September 30, 2023
	Amortized Cost		Gross Unrealized				Fair Value
			Gains		Losses
	(in millions)
U.S. government-sponsored debt securities	$	1,109	$	1	$	(2)	$	1,108
U.S. Treasury securities	4,697		—		(80)		4,617
Total	$	5,806	$	1	$	(82)	$	5,725

Debt securities with unrealized losses for less than 12 months and 12 months or greater were as follows:

	September 30, 2024
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(in millions)
U.S. government-sponsored debt securities	$	—	$	—	$	164	$	—
U.S. Treasury securities	—		—		1,019		(5)
Total	$	—	$	—	$	1,183	$	(5)

	September 30, 2023
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(in millions)
U.S. government-sponsored debt securities	$	412	$	(2)	$	50	$	—
U.S. Treasury securities	1,360		(12)		2,128		(68)
Total	$	1,772	$	(14)	$	2,178	$	(68)

Schedule of Debt Securities Classified by Contractual Maturity Date

The stated maturities of debt securities were as follows:

	September 30, 2024
	(in millions)
Due within one year	$	2,968
Due after one year through five years	2,483
Total	$	5,451

Schedule of Non-Marketable Equity Securities

The following table summarizes the Company’s non-marketable equity securities held as of period end that were accounted for using the fair value measurement alternative:

	September 30,
	2024		2023
	(in millions)
Initial cost basis	$	711	$	719
Adjustments:
Upward adjustments	910		899
Downward adjustments, including impairment	(465)		(445)
Carrying amount	$	1,156	$	1,173

Unrealized gains and losses of the Company’s non-marketable equity securities held as of period end that were accounted for using the fair value measurement alternative were as follows:

	For the Years Ended September 30,
	2024		2023		2022
	(in millions)
Upward adjustments	$	10	$	94	$	231
Downward adjustments, including impairment	$	(35)	$	(99)	$	(341)

Schedule of Investment Income

Investment income (expense) consisted of the following:

	For the Years Ended September 30,
	2024		2023		2022
	(in millions)
Interest and dividend income on cash and investments	$	992	$	745	$	69
Gains (losses) on investments, net	(44)		(82)		(296)
Investment income (expense)	$	948	$	663	$	(227)