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Fair Value Measurements and Investments (Tables) | 9 Months Ended
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Jun. 30, 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 |  |
| June 30, 2025 |  | September 30, 2024 |  | June 30, 2025 |  | September 30, 2024 |  |  |  |
| (in millions)
Assets |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and restricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 13,412 |  |  | $ | 10,403 |  |  | $ | — |  |  | $ | — |  |  |  |  |
U.S. Treasury securities | 7 |  |  | 7 |  |  | — |  |  | — |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities | 318 |  |  | 301 |  |  | — |  |  | — |  |  |  |  |
U.S. government-sponsored debt securities | — |  |  | — |  |  | 304 |  |  | 496 |  |  |  |  |
U.S. Treasury securities | 2,669 |  |  | 4,948 |  |  | — |  |  | — |  |  |  |  |
Other current and non-current assets: |  |  |  |  |  |  |  |  |  |  |
Money market funds | 27 |  |  | 25 |  |  | — |  |  | — |  |  |  |  |
Derivative instruments | — |  |  | — |  |  | 89 |  |  | 103 |  |  |  |  |
Total | $ | 16,433 |  |  | $ | 15,684 |  |  | $ | 393 |  |  | $ | 599 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued compensation and benefits: |  |  |  |  |  |  |  |  |  |  |
Deferred compensation liability | $ | 254 |  |  | $ | 238 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivative instruments | — |  |  | — |  |  | 435 |  |  | 226 |  |  |  |  |
Total | $ | 254 |  |  | $ | 238 |  |  | $ | 435 |  |  | $ | 226 |  |  |  |  |
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:
| June 30, 2025
| Amortized Cost |  | Gross Unrealized |  | Fair Value
| Gains |  | Losses |
| (in millions)
U.S. government-sponsored debt securities | $ | 303 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 304 |
U.S. Treasury securities | 2,661 |  |  | 15 |  |  | — |  |  | 2,676 |
Total | $ | 2,964 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 2,980 |
| 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 |
Schedule of Debt Securities Classified by Contractual Maturity Date | The stated maturities of debt securities were as follows:
|  | June 30, 2025
|  | (in millions)
Due within one year |  | $ | 1,840 |
Due after one year through five years |  | 1,140 |
Total |  | $ | 2,980 |
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:
| June 30, 2025 |  | September 30, 2024 |
| (in millions) |
Initial cost basis | $ | 709 |  |  | $ | 711 |  |
Adjustments: |  |  |  |
Upward adjustments | 854 |  |  | 910 |  |
Downward adjustments, including impairment | (495) |  |  | (465) |  |
Carrying amount | $ | 1,068 |  |  | $ | 1,156 |  |
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 June 30, |  | Nine Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions)
Upward adjustments | $ | 4 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 9 |
Downward adjustments, including impairment | $ | (2) |  |  | $ | (13) |  |  | $ | (51) |  |  | $ | (28) |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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