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Additional Financial Information (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Nov. 08, 2024 $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares
Supplemental Cash Flow Information [Line Items]
Interest payments		$ 183	$ 157	$ 122
Foreign income and withholding taxes		135	219	141
Noncash investing activities related to acquisition of music publishing rights and music catalogs		30
Net gain on divestitures		32	41	0
Dividends paid		$ 361	$ 340	$ 318
Common stock dividends (in dollars per share) | $ / shares		$ 0.69	$ 0.65	$ 0.61
Class A Common Stock | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Common stock dividends (in dollars per share) | $ / shares	$ 0.18
Common Class B | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Common stock dividends (in dollars per share) | $ / shares	$ 0.18
Revolving Credit Facility | Line of Credit
Supplemental Cash Flow Information [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio		3.50
Debt instrument, covenant, total indebtedness to EBITDA ratio, actual		2.05

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