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Fair Value Measurements and Investments
 3 Months Ended
Dec. 31, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements and Investments
Note 5—Fair Value Measurements and Investments
Assets and Liabilities Measured at Fair Value on a Recurring Basis
 Fair Value Measurements
Using Inputs Considered as
 Level 1Level 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 
Level 1 assets and liabilities. Money market funds, U.S. Treasury securities and marketable equity securities are classified as Level 1 within the fair value hierarchy, as fair value is based on unadjusted quoted prices in active markets for identical assets. The Company’s deferred compensation liability is measured at fair value based on marketable equity securities held under the deferred compensation plan.
Level 2 assets and liabilities. The fair value of U.S. government-sponsored debt securities, as provided by third-party pricing vendors, is based on quoted prices in active markets for similar, not identical, assets. Derivative instruments are valued using inputs that are observable in the market or can be derived principally from or corroborated by observable market data.
U.S. Government-sponsored Debt Securities and U.S. Treasury Securities
The amortized cost, gross unrealized gains and losses and fair value of debt securities were as follows:
December 31, 2025
Amortized
Cost		Gross UnrealizedFair
Value
GainsLosses
(in millions)
U.S. government-sponsored debt securities$179 $1 $— $180 
U.S. Treasury securities1,504 13 — 1,517 
Total$1,683 $14 $— $1,697 
September 30, 2025
Amortized
Cost		Gross UnrealizedFair
Value
GainsLosses
(in millions)
U.S. government-sponsored debt securities$304 $1 $— $305 
U.S. Treasury securities2,101 15 — 2,116 
Total$2,405 $16 $— $2,421 
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 
Equity Securities
Fair value measurement alternative. The Company’s investments in privately held companies do not have readily determinable fair values. These investments are measured at fair value on a non-recurring basis and are classified as Level 3 due to the absence of quoted market prices, the inherent lack of liquidity and the fact that significant inputs used to measure fair value are unobservable and require management’s judgment.
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,
20252024
(in millions)
Upward adjustments$3 $— 
Downward adjustments, including impairment
$— $(91)
Other Fair Value Disclosures
Debt. Debt instruments are measured at amortized cost on the Company’s consolidated balance sheets. The fair value of the debt instruments, as provided by third-party pricing vendors, is based on quoted prices in active markets for similar, not identical, instruments. If measured at fair value in the financial statements, these instruments would be classified as Level 2 in the fair value hierarchy. As of December 31, 2025, the carrying value
and estimated fair value of debt was $21.2 billion and $19.4 billion, respectively. As of September 30, 2025, the carrying value and estimated fair value of debt was $25.2 billion and $23.3 billion, respectively.
Other financial instruments not measured at fair value. As of December 31, 2025, the carrying values of settlement receivable and payable, accounts receivable and payable, and customer collateral are an approximate fair value due to their generally short maturities. If measured at fair value in the financial statements, these instruments would be classified as Level 2 in the fair value hierarchy.
Non-financial assets. Certain non-financial assets such as goodwill, intangible assets and property, equipment and technology are subject to non-recurring fair value measurements if they are deemed to be impaired. The Company performed an annual impairment review of its indefinite-lived intangible assets and goodwill as of February 1, 2025, and concluded there was no impairment as of that date. No recent events or changes in circumstances indicated that impairment existed as of December 31, 2025.