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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Total gross intangible assets subject to amortization | $ 5,743 | $ 5,106
Accumulated amortization | (2,979) | (2,747)
Total net intangible assets subject to amortization | 2,764 | 2,359
Intangible assets not subject to amortization: |  |
Trademarks and tradenames | 154 | 152
Total net intangible assets | 2,918 | 2,511
Trademarks and tradenames |  |
Intangible assets not subject to amortization: |  |
Trademarks and tradenames | $ 154 | 152
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 | $ 1,780 | 1,616
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 | $ 2,677 | 2,227
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 | $ 1,143 | 1,125
Trademarks |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 16 years |
Total gross intangible assets subject to amortization | $ 55 | 69
Other intangible assets |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 6 years |
Total gross intangible assets subject to amortization | $ 88 | $ 69

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