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Fair Value Measurements and Investments (Tables) | 9 Months Ended
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Jun. 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 Using Inputs Considered as
| Level 1 |  | Level 2 |  |
| June 30, 2024 |  | September 30, 2023 |  | June 30, 2024 |  | September 30, 2023 |  |  |  |
| (in millions)
Assets |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and restricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 9,703 |  |  | $ | 13,504 |  |  | $ | — |  |  | $ | — |  |  |  |  |
U.S. Treasury securities | 7 |  |  | 301 |  |  | — |  |  | — |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities | 286 |  |  | 339 |  |  | — |  |  | — |  |  |  |  |
U.S. government-sponsored debt securities | — |  |  | — |  |  | 789 |  |  | 1,108 |  |  |  |  |
U.S. Treasury securities | 5,659 |  |  | 4,316 |  |  | — |  |  | — |  |  |  |  |
Other current and non-current assets: |  |  |  |  |  |  |  |  |  |  |
Money market funds | 29 |  |  | 23 |  |  | — |  |  | — |  |  |  |  |
Derivative instruments | — |  |  | — |  |  | 278 |  |  | 293 |  |  |  |  |
Total | $ | 15,684 |  |  | $ | 18,483 |  |  | $ | 1,067 |  |  | $ | 1,401 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued compensation and benefits: |  |  |  |  |  |  |  |  |  |  |
Deferred compensation liability | $ | 229 |  |  | $ | 175 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |
Derivative instruments | — |  |  | — |  |  | 263 |  |  | 396 |  |  |  |  |
Total | $ | 229 |  |  | $ | 175 |  |  | $ | 263 |  |  | $ | 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:
| June 30, 2024
| Amortized Cost |  | Gross Unrealized |  | Fair Value
| Gains |  | Losses |
| (in millions)
U.S. government-sponsored debt securities | $ | 791 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 789 |
U.S. Treasury securities | 5,688 |  |  | 4 |  |  | (26) |  |  | 5,666 |
Total | $ | 6,479 |  |  | $ | 4 |  |  | $ | (28) |  |  | $ | 6,455 |
| 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:
| June 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 | $ | 526 |  |  | $ | (1) |  |  | $ | 164 |  |  | $ | (1) |
U.S. Treasury securities | 2,496 |  |  | (7) |  |  | 1,704 |  |  | (19) |
Total | $ | 3,022 |  |  | $ | (8) |  |  | $ | 1,868 |  |  | $ | (20) |
| 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:
|  | June 30, 2024
|  | (in millions)
Due within one year |  | $ | 3,418 |
Due after one year through five years |  | 3,037 |
Total |  | $ | 6,455 |
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, 2024 |
| (in millions) |
Initial cost basis | $ | 710 |  |
Adjustments: |  |
Upward adjustments | 909 |  |
Downward adjustments, including impairment | (458) |  |
Carrying amount | $ | 1,161 |  |
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (in millions)
Upward adjustments | $ | — |  |  | $ | 75 |  |  | $ | 9 |  |  | $ | 94 |
Downward adjustments, including impairment | $ | (13) |  |  | $ | — |  |  | $ | (28) |  |  | $ | (86) |

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