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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2019
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Total gross intangible asset subject to amortization | $ 3,398 | $ 3,347
Accumulated amortization | (1,774) | (1,624)
Total net intangible assets subject to amortization | 1,624 | 1,723
Intangible assets not subject to amortization | 152 | 151
Total net intangible assets | 1,776 | 1,874
Trademarks and tradenames |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | $ 152 | 151
Recorded music catalog |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 10 years |
Total gross intangible asset subject to amortization | $ 863 | 855
Music publishing copyrights |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 26 years |
Total gross intangible asset subject to amortization | $ 1,567 | 1,539
Artist and songwriter contracts |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 13 years |
Total gross intangible asset subject to amortization | $ 850 | 841
Trademarks |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 18 years |
Total gross intangible asset subject to amortization | $ 54 | 53
Other intangible assets |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 7 years |
Total gross intangible asset subject to amortization | $ 64 | $ 59

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