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Debt - Narrative (Details) € in Millions, $ in Millions				12 Months Ended
	Aug. 16, 2021 USD ($)	Apr. 15, 2021 USD ($)	Mar. 08, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2021 EUR (€)	Aug. 31, 2021	Aug. 16, 2021 EUR (€)	Apr. 30, 2021	Apr. 14, 2021 USD ($)	Jan. 20, 2021 USD ($)	Nov. 02, 2020 USD ($)	Aug. 12, 2020 USD ($)	Jun. 30, 2020	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 10	$ 12		$ 22	$ 34	$ 7
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%
Face or principal amount of debt instrument | €							€ 325										€ 325
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%
Face or principal amount of debt instrument																$ 535
3.000% Senior Secured Notes due 2031 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate							3.00%					3.00%	3.00%	3.00%
Face or principal amount of debt instrument													$ 250	$ 550
Debt issuance costs														$ 4
5.500% Senior Notes due 2026
Debt Instrument [Line Items]
Interest rate					5.50%	5.50%	5.50%
5.500% Senior Notes due 2026 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate		5.50%	5.50%				5.50%			5.50%
Debt instrument remaining outstanding amount		$ 343
Redemption price, percentage of principal amount redeemed		102.75%
Senior Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, fee amount												$ 3
Debt issuance costs												$ 1
Senior Term Loan Facility | Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 1,145									$ 325
Line of credit facility, increase (decrease), net			$ 325
Line of credit facility, maximum borrowing capacity			$ 1,145
2.250% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					2.25%	2.25%	2.25%
2.250% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate							2.25%		2.25%			2.25%
Face or principal amount of debt instrument | €							€ 445		€ 445
3.625% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					3.625%	3.625%	3.625%
3.625% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate							3.625%	3.625%	3.625%
Face or principal amount of debt instrument | €							€ 445
Debt instrument remaining outstanding amount | €									€ 463
Redemption price, percentage of principal amount redeemed	102.28%

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