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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 25, 2023 | Dec. 16, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,993 | $ 1,920 | $ 1,830
TenThousand Projects |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of voting interests acquired (as a percent) | 51.00% |  |  |  |
Purchase price of selected assets | $ 98 |  |  |  |
Final purchase price | 102 |  |  |  |
Base price payable | 12 |  |  |  |
Fair value of net assets acquired | 21 |  |  |  |
Intangible assets | 153 |  |  |  |
Noncontrolling interest, fair value | 106 |  |  |  |
Goodwill | 43 |  |  |  |
Business acquisition, transaction costs |  |  | 3 |  |
TenThousand Projects | Recorded music catalog |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | 99 |  |  |  |
TenThousand Projects | Artist and songwriter contracts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | 49 |  |  |  |
TenThousand Projects | Trademarks |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets | $ 5 |  |  |  |
300 Entertainment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price of selected assets |  | $ 394 |  |  |
Final purchase price |  | 400 |  |  |
Goodwill |  | $ 138 |  |  |
Decrease to intangible assets |  |  | 1 |  |
Decrease in other liabilities |  |  | 2 |  |
Decrease in other assets |  |  | 2 |  |
Goodwill, purchase accounting adjustments |  |  | $ 3 |  |
300 Entertainment | Selling, General and Administrative Expenses |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, transaction costs |  |  |  | $ 3 |

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