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Acquisitions - Narrative (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 25, 2023	Dec. 16, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Goodwill			$ 1,993	$ 1,920	$ 1,830
TenThousand Projects
Business Acquisition [Line Items]
Percentage of voting interests acquired (as a percent)	51.00%
Purchase price of selected assets	$ 98
Final purchase price	102
Base price payable	12
Fair value of net assets acquired	21
Intangible assets	153
Noncontrolling interest, fair value	106
Goodwill	43
Business acquisition, transaction costs			3
TenThousand Projects | Recorded music catalog
Business Acquisition [Line Items]
Intangible assets	99
TenThousand Projects | Artist and songwriter contracts
Business Acquisition [Line Items]
Intangible assets	49
TenThousand Projects | Trademarks
Business Acquisition [Line Items]
Intangible assets	$ 5
300 Entertainment
Business Acquisition [Line Items]
Purchase price of selected assets		$ 394
Final purchase price		400
Goodwill		$ 138
Decrease to intangible assets			1
Decrease in other liabilities			2
Decrease in other assets			2
Goodwill, purchase accounting adjustments			$ 3
300 Entertainment | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition, transaction costs				$ 3

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