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Additional Financial Information - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Nov. 09, 2021 $ / shares	Aug. 13, 2021 $ / shares	Apr. 03, 2020
Supplemental Cash Flow Information [Line Items]
Interest payments | $	$ 137	$ 128	$ 138
Foreign income and withholding taxes | $	124	81	63
Dividends paid | $	$ 265	$ 344	$ 94
Revolving Credit Facility | Line of Credit
Supplemental Cash Flow Information [Line Items]
Debt instrument, covenant, total indebtedness to EBITDA ratio	3.50					3.25
Common Class A
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share)					$ 0.15
Common Class A | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share)				$ 0.15
Common Class B
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share)					$ 0.15
Common Class B | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in dollars per share)				$ 0.15

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