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Additional Financial Information (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares
Dividends Payable [Line Items]
Interest payments	$ 18	$ 33
Income and withholding taxes paid	43	39
Noncash acquisition activities	18	18
Net gain on divestitures	0	$ 17
Pre-tax realized net gain on sale of an investment	$ 29
Debt instrument, covenant, total indebtedness to EBITDA ratio	3.50
Dividends (in dollars per share) | $ / shares	$ 0.18	$ 0.17
Dividends paid	$ 94	$ 89
Dividends paid (in dollars per share) | $ / shares	$ 0.18
Class A Common Stock
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares	0.18
Class B Common Stock
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares	$ 0.18

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