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Debt - Redemption of 4.125% Senior Secured Notes and 4.875% Senior Secured Notes (Details) € in Millions, $ in Millions				12 Months Ended
	Aug. 16, 2021 USD ($)	Apr. 15, 2021 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2021 EUR (€)	Jan. 20, 2021	Jun. 30, 2020 EUR (€)	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 10	$ 12		$ 22	$ 34	$ 7
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate					4.125%	4.125%	4.125%
4.125% Senior Secured Notes due 2024 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			4.125%				4.125%		4.125%	4.125%	4.125%
Face or principal amount of debt instrument | €									€ 311		€ 311
Debt instrument remaining outstanding amount | €									€ 322
Redemption price, percentage of principal amount redeemed			103.094%
4.875% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					4.875%	4.875%	4.875%
4.875% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			4.875%				4.875%		4.875%	4.875%	4.875%
Face or principal amount of debt instrument			$ 220							$ 220
Debt instrument remaining outstanding amount			$ 230
Redemption price, percentage of principal amount redeemed			103.656%
Loss on extinguishment of debt					$ 24
3.875% Senior Secured Notes due 2030 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			3.875%				3.875%	3.875%	3.875%	3.875%	3.875%
Face or principal amount of debt instrument										$ 535
2.750% Senior Secured Notes due 2028 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			2.75%				2.75%	2.75%	2.75%	2.75%	2.75%
Face or principal amount of debt instrument | €							€ 325				€ 325

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