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Fair Value Measurements and Investments (Tables) | 12 Months Ended
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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) |

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