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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Accounting Policies [Line Items] |  |  |
Foreign currency transaction gain (loss) recognized | $ 4 | $ (11) | $ 0
Foreign currency transaction gain (loss) recognized in other income (expense) | (37) | 185 | (8)
Advertising expense | $ 136 | $ 155 | $ 149
Award requisite service period | 4 years |  |
Performance Share Units PSU |  |  |
Accounting Policies [Line Items] |  |  |
Award requisite service period | 3 years |  |
Furniture and fixtures | Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Property plant and equipment useful life | 5 years |  |
Furniture and fixtures | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Property plant and equipment useful life | 7 years |  |
Computer Equipment | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Property plant and equipment useful life | 5 years |  |
Machinery and equipment | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Property plant and equipment useful life | 13 years |  |
Building | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Property plant and equipment useful life | 40 years |  |
Spotify | Accounts Receivable | Credit Concentration Risk |  |  |
Accounting Policies [Line Items] |  |  |
Customer concentration percentage (as a percent) | 18.00% | 17.00% |

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