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Additional Financial Information (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Aug. 07, 2025 $ / shares	Jun. 30, 2025 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares	Jun. 30, 2025 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares
Dividends Payable [Line Items]
Interest payments | $		$ 43	$ 35	$ 114	$ 125
Income and withholding taxes paid | $		50	33	151	105
Noncash acquisition activities | $				32	18
Net gain on divestitures | $		$ 0	$ 1	0	$ 32
Pre-tax realized net gain on sale of an investment | $				$ 29
Debt instrument, covenant, total indebtedness to EBITDA ratio		3.50		3.50
Dividends (in dollars per share) | $ / shares		$ 0.18	$ 0.17	$ 0.54	$ 0.51
Dividends paid | $		$ 94		$ 283	$ 267
Dividends paid (in dollars per share) | $ / shares		$ 0.18		$ 0.54
Class A Common Stock
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares		0.18
Class A Common Stock | Subsequent Event
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares	$ 0.19
Class B Common Stock
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares		$ 0.18
Class B Common Stock | Subsequent Event
Dividends Payable [Line Items]
Dividends (in dollars per share) | $ / shares	$ 0.19

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