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Additional Financial Information - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Nov. 07, 2025 $ / shares	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares
Dividends Payable [Line Items]
Interest payments		$ 167	$ 183	$ 157
Income and withholding taxes paid		181	135	219
Noncash investing activities related to acquisition of music publishing rights and music catalogs		40	30
Net gain on divestitures		0	32	41
Pre-tax realized net gain on sale of an investment		29
Dividends paid		$ 383	$ 361	$ 340
Common stock dividends (in dollars per share) | $ / shares		$ 0.73	$ 0.69	$ 0.65
Recorded Music
Dividends Payable [Line Items]
Impairment expense		$ 79
Class A Common Stock | Subsequent Event
Dividends Payable [Line Items]
Common stock dividends (in dollars per share) | $ / shares	$ 0.19
Class B Common Stock | Subsequent Event
Dividends Payable [Line Items]
Common stock dividends (in dollars per share) | $ / shares	$ 0.19
Revolving Credit Facility | Line of Credit
Dividends Payable [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio		3.50
Debt instrument, covenant, total indebtedness to EBITDA ratio, actual		2.02

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