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Additional Financial Information - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Nov. 10, 2022 $ / shares	Aug. 13, 2021 $ / shares
Supplemental Cash Flow Information [Line Items]
Interest payments | $	$ 122	$ 137	$ 128
Foreign income and withholding taxes | $	141	124	81
Dividends paid | $	318	$ 265	$ 344
Noncash investing activities related to acquisition of music publishing rights and music catalogs | $	$ 125
Revolving Credit Facility | Line of Credit
Supplemental Cash Flow Information [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio	3.50
Common Class A
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares					$ 0.16
Common Class A | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares				$ 0.16
Common Class B
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares					$ 0.16
Common Class B | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares				$ 0.16

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