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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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