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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Total gross intangible assets subject to amortization | $ 5,106 | $ 4,839
Accumulated amortization | (2,747) | (2,486)
Total net intangible assets subject to amortization | 2,359 | 2,353
Intangible assets not subject to amortization: |  |
Trademarks and tradenames | 152 | 149
Total net intangible assets | 2,511 | 2,502
Trademarks and tradenames |  |
Intangible assets not subject to amortization: |  |
Trademarks and tradenames | $ 152 | 149
Recorded music catalog |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 12 years |
Total gross intangible assets subject to amortization | $ 1,616 | 1,507
Music publishing copyrights |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 24 years |
Total gross intangible assets subject to amortization | $ 2,227 | 2,026
Artist and songwriter contracts |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 13 years |
Total gross intangible assets subject to amortization | $ 1,125 | 1,091
Trademarks |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 18 years |
Total gross intangible assets subject to amortization | $ 69 | 111
Other intangible assets |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 7 years |
Total gross intangible assets subject to amortization | $ 69 | $ 104

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