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Acquisitions - Schedule of Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 16, 2021 | Sep. 30, 2021
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,993 | $ 1,920 |  | $ 1,830
300 Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and equivalents |  |  | $ 2 |
Accounts receivable |  |  | 5 |
Royalty advances |  |  | 13 |
Property, plant and equipment, net |  |  | 1 |
Operating lease right-of-use assets, net |  |  | 3 |
Goodwill |  |  | 138 |
Intangible assets subject to amortization, net |  |  | 259 |
Other assets |  |  | 1 |
Accounts payable |  |  | (5) |
Accrued royalties |  |  | (19) |
Accrued liabilities |  |  | (1) |
Operating lease liabilities, noncurrent |  |  | (3) |
Total purchase price allocated |  |  | 394 |
300 Entertainment | Recorded music catalog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets subject to amortization, net |  |  | 154 |
300 Entertainment | Artist and songwriter contracts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets subject to amortization, net |  |  | 90 |
300 Entertainment | Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets subject to amortization, net |  |  | 12 |
300 Entertainment | Music publishing copyrights |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets subject to amortization, net |  |  | $ 3 |

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