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Fair Value Measurements and Investments (Tables)

3 Months Ended

Dec. 31, 2025

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 Using Inputs Considered as
			Level 1												Level 2
			December 31, 2025						September 30, 2025						December 31, 2025						September 30, 2025
			(in millions)
Assets
Cash equivalents and restricted cash equivalents:
Money market funds			$	12,272					$	13,760					$	—					$	—
Investment securities:
Marketable equity securities			428						411						—						—
U.S. government-sponsored debt securities			—						—						180						305
U.S. Treasury securities			1,517						2,116						—						—
Other current and non-current assets:
Money market funds			25						28						—						—
Derivative instruments			—						—						83						62
Total			$	14,242					$	16,315					$	263					$	367
Liabilities
Accrued compensation and benefits:
Deferred compensation liability			$	300					$	268					$	—					$	—
Accrued and other liabilities:
Derivative instruments			—						—						230						319
Total			$	300					$	268					$	230					$	319

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

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

			December 31, 2025
			Amortized Cost						Gross Unrealized												Fair Value
									Gains						Losses
			(in millions)
U.S. government-sponsored debt securities			$	179					$	1					$	—					$	180
U.S. Treasury securities			1,504						13						—						1,517
Total			$	1,683					$	14					$	—					$	1,697

			September 30, 2025
			Amortized Cost						Gross Unrealized												Fair Value
									Gains						Losses
			(in millions)
U.S. government-sponsored debt securities			$	304					$	1					$	—					$	305
U.S. Treasury securities			2,101						15						—						2,116
Total			$	2,405					$	16					$	—					$	2,421

Schedule of Debt Securities Classified by Contractual Maturity Date

The stated maturities of debt securities were as follows:

						December 31, 2025
						(in millions)
Due within one year						$	1,341
Due after one year through five years						356
Total						$	1,697

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:

			December 31, 2025						September 30, 2025
			(in millions)
Initial cost basis			$	714					$	711
Adjustments:
Upward adjustments			567						564
Downward adjustments, including impairment			(219)						(219)
Carrying amount			$	1,062					$	1,056

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:

									Three Months Ended December 31,
															2025						2024
															(in millions)
Upward adjustments															$	3					$	—
Downward adjustments, including impairment															$	—					$	(91)

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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